XLRN


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingIncomeLoss

us-gaap:ResearchAndDevelopmentExpense
us-gaap:CounterpartyName
us-gaap:CounterpartyName, us-gaap:TypeOfArrangement

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues

us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:CounterpartyName, us-gaap:TypeOfArrangement

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability
us-gaap:SubsequentEventType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInDueFromRelatedPartiesCurrent

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
us-gaap:Range, us-gaap:SubsequentEventType
us-gaap:OperatingLeasesRentExpenseNet

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsOfStockIssuanceCosts

us-gaap:PaymentsToAcquireMarketableSecurities
us-gaap:ProductOrService, us-gaap:TypeOfArrangement
us-gaap:ProceedsFromCollaborators

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockConsiderationReceivedOnTransaction
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

xlrn:IncreaseDecreaseInNonCashLeaseExpense

xlrn:IncreaseDecreaseOperatingLeaseLiability

xlrn:NetProceedsFromStockOptionsStockAwardsEmployeeStockPurchasePlanAndWarrantsExercised

xlrn:StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis
us-gaap:StatementEquityComponents

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedRoyaltiesCurrentAndNoncurrent
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
us-gaap:AwardType
us-gaap:PlanName, us-gaap:SubsidiarySaleOfStock

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DueFromRelatedPartiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
us-gaap:PlanName

us-gaap:InterestReceivable

us-gaap:InterestReceivableCurrent

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherPrepaidExpenseCurrent

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:FinancialInstrument, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:RestrictedCashEquivalentsNoncurrent
us-gaap:FinancialInstrument, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount

xlrn:AccruedCommercialExpenseCurrent

xlrn:AccruedPurchases

xlrn:AccruedResearchAndDevelopmentExpenseCurrent

xlrn:CashCashEquivalentsAndAvailableForSaleSecurities

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

xlrn:CashCashEquivalentsAndAvailableforsaleSecuritiesAmortizedCostBasis

xlrn:CashandCashEquivalentsAccumulatedGrossUnrealizedLossbeforeTax

xlrn:CashandCashEquivalentsAmortizedCostBasis
us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory
xlrn:CollaborativeArrangementFutureMilestonePaymentsReceivable
us-gaap:CounterpartyName, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory
xlrn:CollaborativeArrangementMilestonePaymentsPotential
us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement
xlrn:CollaborativeArrangementOptionFeesPotential
us-gaap:ProductOrService, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory
xlrn:CollaborativeArrangementPotentialMilestonePaymentsOnAcceptanceOfRegulatoryApplication

xlrn:DeferredTaxAssetsLeaseLiability

xlrn:OperatingLeaseLeasedArea

xlrn:PrepaidExpensesAndOtherCurrentAssetsPrepaidClinicalTrialExpenses

Plots across concepts


IncomeStatement
Operating Income Loss
Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Property Plant And Equipment Net
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Other Accrued Liabilities Current
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
Shares
Weighted Average Number Of Share Outstanding Basic And Diluted
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:CommonStockValue ████▆▆▆▆▆▆▅▅▅▅▅▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂0.0610.060.060.060.0540.0530.0530.0540.0530.0530.0470.0470.0470.0460.0460.0450.0390.0390.0390.0380.0380.0380.0340.0340.0340.0330.0330.0330.0320.0320.0290.035NANA0.00075NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 60.724NANANA53.86NANANANANANANANANANANANA38.404NANANA38.666NANANA32.633NA31.85531.552NANA4.4061.11425NANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 60.724NANANA53.86NANANANANANANANANANANANA38.404NANANA36.911NANANA32.633NA31.85531.552NANA4.4060.6095NANANANANA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted NA60.579NA59.6453.8653.361NA52.88252.68951.126NA46.05145.78945.516NA39.36138.63138.404NA37.61637.272NANA33.09732.8732.633NA31.85531.55230.321NA4.406NA9.74NA2.4NANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█4.4114.482NA4.1374.2644.841NA4.3484.5084.797NA4.2244.3814.401NA4.0934.4284.468NA4.2784.5211.493NA4.2693.9164.124NA4.0844.3334.756NA21.3360.023.002NA22.65NANA
us-gaap:EarningsPerShareBasic -1.05NANANA-0.34NANANANANANANANANA-0.62-0.65-0.77-0.66-0.51-0.55-0.590.14-0.81-0.36-0.32-0.45-0.55-0.25-0.52-0.3-0.64-5.621.2-0.96-28.4-23.28-23.72-6.0
us-gaap:EarningsPerShareDiluted -1.05NANANA-0.34NANANANANANANANANA-0.62-0.65-0.77-0.66-0.51-0.55-0.590.13-0.81-0.36-0.32-0.45-0.55-0.25-0.52-0.3-0.64-5.621.12-0.96-28.4-23.28-23.72-6.0
us-gaap:EarningsPerShareBasicAndDiluted NA-1.05-0.95-0.66-0.34-0.95-0.44-0.86-0.34-0.74-0.75-0.63-0.63-0.58-0.62-0.65-0.77-0.66-0.51-0.55-0.59NA-0.7999999999999998-0.36-0.32-0.45-0.44999999999999996-0.25-0.52-0.32.59-5.62NA-0.24-7.109999999999999-5.82NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▇█▅▄▄▄▃▃▃▄▄▄▄▃▄▃▅▄▁▃▃▃▃▂▂▂▁▁13.47915.6268.4327.9867.146.6795.6855.3065.0126.9926.5076.4075.965.6966.3715.7069.5886.5830.54.5884.5514.2483.783.0642.662.5721.4511.194NA1.018NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁▁▂▃▅▂▅▃▅▃▄▄▄▄▄▄▄▄▅▅▅▇▄▆▆▅▅▆▅▆▅▅█▇▆▆-63.513-63.6-57.458-39.387-18.29-51.206-23.683-45.398-17.41-37.785-34.57-28.662-28.658-26.648-28.568-25.351-29.623-25.382-19.592-21.144-21.7895.306-27.281-11.817-10.402-14.617-17.617-7.972-16.55-9.12-18.11-18.51313.0781.647-10.379-7.215NANA
us-gaap:CostsAndExpenses ██▇▅▅▅▆▅▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▂▁▁▁▁▁▁▁▁▁91.60288.36183.46161.78958.66555.91664.91953.13148.80243.58540.62233.3233.59130.87232.34128.59232.96829.56325.35523.51322.8522.15721.91918.76818.81119.47918.29314.89921.38915.51514.97211.15412.27611.87612.17910.76310.94410.257
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▁▁▂▃▆▂▅▃▆▄▄▅▅▅▅▅▄▅▆▅▅█▅▆-63.513-63.466-57.405-39.234-18.447-50.924-23.579-45.403-17.906-38.033-34.771-28.991-28.927-26.209-27.867-25.492-29.663-25.401-19.245-20.79-22.0165.061-27.082-11.858NANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▄▄▃▅▄▅▄▂▁▅▂▃▅▅█▁▄▄▇▃▄▄▄▄▄▄▄▄▄▄0.0080.005-0.010.0110.0040.015-0.004-0.034-0.0440.02-0.036-0.0120.0110.010.061-0.0410.0060.0060.044-0.020.00.00.00.00.00.00.00.00.00.0NA0.00.0NANA0.0NANA
us-gaap:NetIncomeLoss ▁▁▂▃▅▂▅▃▅▃▄▄▄▄▄▄▄▄▅▅▅▇▄▆▆▅▅▆▅▆▅▅█▇▆▆▆▆-63.521-63.471-57.396-39.245-18.451-50.939-23.575-45.369-17.862-38.053-34.734-28.979-28.938-26.219-27.926-25.451-29.669-25.407-19.288-20.77-22.0165.061-27.082-11.858-10.383-14.574-17.617-7.972-16.55-9.12-18.11-24.78513.0781.647-10.379-13.962-7.4-7.588
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-63.521-63.471NA-39.245-18.451-50.939NA-45.369-17.862-38.053NA-28.979-28.938-26.219NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▅▅▅▆▅▅█▃▆▆▅▄▆▆▆▁▂▅▅▅▅0.1490.1370.189-0.0060.4660.6482.0023.523.232.7722.0351.0710.9791.4310.770.0860.2480.4572.742-0.282-2.3619.017-8.9662.7552.7110.485-3.0623.4190.7613.088-14.658-11.629-1.073-1.489-2.185-0.357NANA
us-gaap:OperatingIncomeLoss ▁▁▂▃▅▂▄▂▅▃▃▄▄▄▄▄▄▄▅▅▅▆▅▅▆▅▅▆▅▆▆▆█▇▆▆▆▆-63.662-63.603-57.595-39.228-18.913-51.572-25.581-48.923-21.136-40.805-36.806-30.062-29.906-27.64-28.636-25.578-29.911-25.858-21.986-20.508-19.655-3.956-18.115-14.613-13.094-15.059-14.554-11.391-17.311-12.208-3.451-6.88414.1513.136-8.194-6.858-6.904-6.933
us-gaap:ResearchAndDevelopmentExpense ███▆▅▅▇▅▅▅▄▃▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁56.1357.29957.25440.74738.25137.66348.82837.6334.76532.77129.87524.66725.93323.43125.33921.05921.59821.72719.08817.10216.13816.24616.14313.33514.1514.77914.57911.87612.67711.76510.2178.1438.9118.789.6738.722NANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆▅▅▅█▁█▁▆▁▁▁▁▁▁▁▁▁▁▁▁▄▁▁▂▁▁▁▁▁▃▁▅▃▁▁▁▁27.9424.75825.86622.56139.7524.34439.3384.20827.6662.783.8163.2583.6853.2323.7053.0143.0573.7053.3693.0053.19518.2013.8044.1555.7174.423.7393.5084.0783.30711.5214.2726.42715.0123.9853.9054.043.324
us-gaap:Revenues ▆▅▅▅█▁█▁▆▁▁▁▁▁▁▁▁▁▁▁▁▄▁▁▂▁▁▁▁▁▃▁▅▃▁▁▁▁27.9424.75825.86622.56139.7524.34439.3384.20827.6662.783.8163.2583.6853.2323.7053.0143.0573.7053.3693.0053.19518.2013.8044.1555.7174.423.7393.5084.0783.30711.5214.2726.42715.0123.9853.9054.043.324
us-gaap:SellingGeneralAndAdministrativeExpense █▇▅▄▄▃▂▂▂▁35.47231.06226.20721.04220.41418.25316.09115.50114.03710.814NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:Assets ▇▇██▄▄▄▄▅▅▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▂▂▂▂▁▁836.052875.793932.337947.765479.435464.162504.906519.667550.868560.33314.821338.117351.541370.034389.177381.277208.463229.129247.647262.885274.23289.602146.337158.42167.518175.573186.296200.712214.644223.04123.732127.26NANA49.212NANANA
us-gaap:Liabilities █▇█▅▆▅▅▅▅▅▂▁▁▁▂▂▁▂▂▃▃▃▃▂▂▃▃▃▄▄▇▅73.01864.96277.2352.62957.81650.3455.4354.86650.97149.79522.78419.00518.43216.25423.9622.73619.93120.80922.0533.33830.37429.32537.07426.63228.11529.77930.01133.09144.81742.58365.9252.696NANA71.575NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇██▄▄▄▄▅▅▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▂▂▂▂▁▁836.052875.793932.337947.765479.435464.162504.906519.667550.868560.33314.821338.117351.541370.034389.177381.277208.463229.129247.647262.885274.23289.602146.337158.42167.518175.573186.296200.712214.644223.04123.732127.26NANA49.212NANANA
us-gaap:StockholdersEquity ▇▇██▄▄▄▄▅▅▃▃▃▃▄▄▂▂▂▂▃▃▁▂▂▂▂▂▂▂▁▁763.034810.831855.107895.136421.619413.822449.476464.801499.897510.535292.037319.112333.109353.78365.217358.541188.532208.32225.597229.547243.856260.277109.263131.788139.403145.794156.285167.621169.827180.45757.81274.564NANA-290.973NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:AssetsCurrent ▆▆██▄▄▄▄▄▄▃▃▃▃▃▃▁▁▁▁▁▂▁▁▁▁▂▂▂▂▁▁717.773737.612893.269913.777448.95432.159449.916443.534445.715448.273306.013318.323299.116300.29285.243343.438148.413149.033146.786144.99127.039170.687110.933122.383121.013107.768182.307196.431210.161218.453119.022122.761NANA43.861NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄▅▇█▄▄▃▂▂▃▂▂▂▁▂▃▁▁▁▁▁▁▁▁▁▁▃▃▃▃▂▂▁▁▁▁336.199455.513670.952729.685283.521277.486237.677169.542163.609214.49144.052112.42779.59269.736100.15238.95930.72633.15720.9531.01636.99563.68127.78343.43838.15639.814176.46189.256204.25214.135113.163116.47928.46538.5139.61149.081NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄▅▇█▄▄▃▂▂▃▂▂▂▁▂▃▁▁▁337.796457.11672.549731.282285.118279.083239.274171.139165.206216.087145.649114.02480.72470.868101.282240.09131.85834.28921.896NANANA28.579NANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments █▇▅▅▄▄▆▇█▆▅▆▆▆▅▃▄▄▄▄▃▃▃▃▃▂▁287.151231.736178.951152.677106.289136.954193.692256.529267.151223.106147.26195.545208.338222.119177.07798.266111.695108.22118.74107.27983.724100.78477.06472.45975.79861.3290.0NANANANANANANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▄▃▂▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁66.48625.15617.2658.85419.3889.28410.010.5889.5087.8977.6627.0937.5175.2034.4463.3343.1114.0863.8623.6763.0813.1652.4582.5361.7732.5762.483.9472.181.6852.2432.179NANA1.474NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA40.783NANANA38.046NANANA35.139NANANA31.376NANANA26.958NANANA23.261NANANA22.421NANANA23.39NANANA23.009NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ConstructionInProgressNANA1.628NANANA1.181NANANA1.139NANANA0.584NANANA0.849NANANA0.39NANANA0.011NANANA0.0NANANA0.008NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA12.908NANANA12.347NANANA11.668NANANA11.501NANANA11.126NANANA9.99NANANA9.93NANANA9.93NANANA10.088NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:OfficeEquipmentNANA0.77NANANA0.672NANANA0.672NANANA0.522NANANA0.519NANANA0.26NANANA0.213NANANA0.205NANANA0.179NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType xlrn:ComputerEquipmentAndSoftwareNANA1.786NANANA1.767NANANA1.712NANANA1.501NANANA1.26NANANA1.163NANANA0.956NANANA0.921NANANA0.919NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType xlrn:LaboratoryEquipmentNANA23.691NANANA22.079NANANA19.948NANANA17.268NANANA13.204NANANA11.458NANANA11.311NANANA12.334NANANA11.815NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA33.015NANANA31.234NANANA28.033NANANA24.41NANANA21.757NANANA20.155NANANA19.334NANANA19.685NANANA18.95NANANA
us-gaap:PropertyPlantAndEquipmentNet █▇▇▇▇▆▆▆▆▆▆▅▆▆▆▆▆▆▄▃▃▂▁▁▁▁▁▂▂▂▂▂8.587.8567.7687.6217.6716.6686.8126.8526.7757.0277.1066.276.8687.0196.9667.2117.217.1075.2014.2154.193.7243.1062.9452.9022.9493.0873.3793.5813.6743.7053.564NANA4.059NANANA
us-gaap:LongTermInvestments ▅▆▁▁▁▁▂▃▄▅▁▂▃▄▆▂▄▅▆▇█▇▃▃▃▄▁89.194108.1937.5854.9990.01.12322.47742.21870.15675.5090.011.83544.32861.48895.72329.37251.61771.83794.692112.728141.997114.18831.13432.25342.64163.8850.0NANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▃▂▃▄▅▆▇█18.79920.41521.98819.6621.11622.53123.90825.24726.54927.817NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ███████▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁1.7061.7171.7271.7081.6981.6811.7930.2190.0760.1070.1050.0920.0970.1050.1130.1240.0910.020.0220.0060.0080.0070.3680.0430.060.0690.00.00.0NA0.0920.022NANA0.146NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:AccountsPayableCurrent ▆▃▆▆█▃▂▂▃▃▁▁▁▂▁▁▂▁▂▂▁▁▁▂▂▂▁▃▂▂▁▁9.4384.4638.4728.86112.9273.9292.2951.8543.5483.930.4191.2891.2691.6771.0861.0241.6610.9111.592.0710.5661.2020.8752.6471.791.5670.7243.3142.6142.2950.8850.891NANA0.642NANANA
us-gaap:AccruedLiabilitiesCurrent █▇█▄▃▃▅▄▃▃▃▂▂▂▃▃▂▂▃▂▂▂▂▂▂▁▁▁▁▁▁▁42.48838.07444.68121.91717.96618.18924.89523.82516.76213.80318.20913.14413.11311.07914.93614.14111.3712.96813.24912.81411.82412.67812.48.9688.3776.6926.8485.9386.4754.6596.9275.126NANA6.153NANANA
us-gaap:LiabilitiesCurrent █▇█▅▅▄▄▄▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▂▁▃▂59.47849.81960.16337.30237.3628.5333.37331.6426.05623.2718.91214.68114.57212.94216.74515.88414.29915.19316.14916.19213.69315.17914.49112.87211.4389.7829.25311.11216.0939.18827.2116.523NANA38.802NANANA
us-gaap:OperatingLeaseLiabilityCurrent █▇▅▃▂▂▁7.5527.2827.016.5246.4676.4126.183NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA0.755NANANA0.997NANANA1.118NANANA2.930.017NANA2.432NANANA2.713NANANA1.081NANANA1.65NANANA0.816NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:OtherLiabilitiesNoncurrent 0.373NANANANANANA0.0480.119NA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▃▅▃▅▆█13.16715.14317.06715.32716.9418.50620.201NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA9.235NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA7.296NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA0.867NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA0.888NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA0.373NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:StockholdersEquity ▇▇██▄▄▄▄▅▅▃▃▃▃▄▄▂▂▂▂▃▃▁▂▂▂▂▂▂▂▁▁763.034810.831855.107895.136421.619413.822449.476464.801499.897510.535292.037319.112333.109353.78365.217358.541188.532208.32225.597229.547243.856260.277109.263131.788139.403145.794156.285167.621169.827180.45757.81274.564NANA-290.973NANANA
us-gaap:CommonStockValue ████▆▆▆▆▆▆▅▅▅▅▅▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂0.0610.060.060.060.0540.0530.0530.0540.0530.0530.0470.0470.0470.0460.0460.0450.0390.0390.0390.0380.0380.0380.0340.0340.0340.0330.0330.0330.0320.0320.0290.035NANA0.00075NANANA
us-gaap:AdditionalPaidInCapital ████▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁1767.8111752.0961732.7721715.3431202.4451176.3591160.8071152.4491142.1481135.376879.099871.643858.582850.597839.09803.907608.493598.658590.474574.834567.999562.631416.926412.17407.968403.96399.835393.554387.79381.869250.107NANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▂▃▃▃▃▄▄▄▅▅▅▅▅▆▆▆▆▇▇▇▇▇▇▇▇█████-1004.429-940.908-877.437-820.042-780.797-762.346-711.407-687.833-642.464-624.602-586.549-551.815-524.477-495.539-473.024-445.097-419.646-389.977-364.491-345.203-324.433-302.417-307.477-280.395-268.537-258.156-243.583-225.966-217.995-201.444-192.324-174.221NANA-290.976NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▅▆▆▇▆▇▇█▆▄▃▂▁▃▅▅▅▅▆█▇▆▇▇▇▇-0.409-0.417-0.288-0.225-0.083-0.2440.0230.1310.16-0.292-0.56-0.763-1.043-1.324-0.895-0.314-0.354-0.4-0.425-0.1220.2520.025-0.22-0.021-0.062-0.0430.0NANANANANANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues NANANA492.414NANANANANA248.13NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapitalNANANA492.408NANANANANA248.124NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁█13.47915.626NA7.9867.146.679NA5.3065.0126.992NA6.4075.9595.696NANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▂▅█▄▄▇▅▇▆▆▆▆▆▆▇▇▆▇▇▇█▇▇▇▇-84.415-67.924-38.13-2.796-42.856-46.545-16.251-37.045-14.2-26.308-29.028-20.096-22.151-23.431-20.802-16.818-17.161-21.949-16.74-13.022-15.8720.939-12.461-8.977-8.948-13.825NANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▁▅▄▆██▇▄▁▇▇▆▅▁▇▆▇▆▆▅▂▅▆▆▂-37.134-151.213-29.6-52.2329.94577.48181.71337.981-38.415-152.5759.76745.09929.982-11.921-146.48334.99914.48332.6354.8864.489-11.263-106.917-4.12213.1196.406-124.374NANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁█▁▁▁▁▁▄▁▁▁▁▁▄▁▁▁▁▁▃▁▁▁▁2.2353.6988.997501.1918.9468.8732.6734.9971.734249.3160.8868.2972.0254.93828.476190.0520.2471.5211.7882.5540.449141.8760.9281.140.8841.553NANANANANANANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▂▁▃█▃▄▄▃▃▄▄▄▃▃▂▅▃▃-119.314-215.439-58.733446.1646.03539.80968.1355.933-50.88170.43831.62533.39.856-30.414-138.809208.233-2.43112.393NANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:DepreciationDepletionAndAmortization ▅▅▅▄▄▅▅▅▁█▄▅▄▄▄▄▄▃▃▃▃▃▃▃▂▃▂▃▂▂▂▂▂▂▂1.0361.0261.0040.9030.9420.9961.0090.99-0.2262.1680.8791.0020.9620.9040.8020.7990.6830.5410.5180.4430.3910.3240.3050.2970.2830.2910.2860.290.2770.2650.2340.2320.2250.2240.207NANANA
us-gaap:IncreaseDecreaseInAccountsPayable ▆▁▃▁█▄▄▂▃▅▃▃▃▄▃▃▄▃▃▄▃▃▂▄▃▄▂▄▃▄▃▃▄▃▃4.72-4.178-0.485-4.0198.71.6340.441-1.694-0.3373.466-0.753-0.103-0.4080.5910.062-0.6370.849-0.778-0.5521.505-0.267-0.042-1.7720.8570.2230.843-2.590.70.3191.41-0.296-0.0710.561-0.247-0.378NANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet NANA0.00.00.0-0.017-0.01-0.0150.0420.0-0.124-0.186-0.202-0.153NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▂▅█▄▄▇▅▇▆▆▆▆▆▆▇▇▆▇▇▇█▇▇▇▇-84.415-67.924-38.13-2.796-42.856-46.545-16.251-37.045-14.2-26.308-29.028-20.096-22.151-23.431-20.802-16.818-17.161-21.949-16.74-13.022-15.8720.939-12.461-8.977-8.948-13.825NANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▁▁▂▃▅▂▅▃▅▃▄▄▄▄▄▄▄▄▅▅▅▇▄▆▆▅▅▆▅▆▅▅█▇▆▆▆▆-63.521-63.471-57.396-39.245-18.451-50.939-23.575-45.369-17.862-38.053-34.734-28.979-28.938-26.219-27.926-25.451-29.669-25.407-19.288-20.77-22.0165.061-27.082-11.858-10.383-14.574-17.617-7.972-16.55-9.12-18.11-24.78513.0781.647-10.379-13.962-7.4-7.588
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-63.521-63.471NA-39.245-18.451-50.939NA-45.369-17.862-38.053NA-28.979-28.938-26.219NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShareBasedCompensation ▇█▅▅▄▄▃▃▃▄▄▄▄▃▄▃▅▄▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁13.47915.6268.4327.9867.146.6795.6855.3065.0126.9926.5076.4075.9595.6966.3715.7059.5896.5835.174.5874.5524.2483.783.0642.662.5721.4511.21.1141.0180.7550.50.520.4280.345NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▁▅▄▆██▇▄▁▇▇▆▅▁▇▆▇▆▆▅▂▅▆▆▂-37.134-151.213-29.6-52.2329.94577.48181.71337.981-38.415-152.5759.76745.09929.982-11.921-146.48334.99914.48332.6354.8864.489-11.263-106.917-4.12213.1196.406-124.374NANANANANANANANANANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▄▄▄▇▂▄▄▃▃▃▃▄▃▃▃█▃▅▃▄▂▂▂▁▁▁▁▂▁▁▁▁▁▁0.9690.920.90.8831.9940.4261.1210.8930.6860.5870.6890.5280.8690.5040.7570.7112.2510.6771.1340.6861.0710.4890.30.4150.0860.1580.0160.1190.2290.150.120.0620.0450.080.119NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁█▁▁▁▁▁▄▁▁▁▁▁▄▁▁▁▁▁▃▁▁▁▁2.2353.6988.997501.1918.9468.8732.6734.9971.734249.3160.8868.2972.0254.93828.476190.0520.2471.5211.7882.5540.449141.8760.9281.140.8841.553NANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value61000.060000.060000.060000.054000.053000.053000.054000.053000.053000.047000.047000.047000.046000.046000.045000.039000.039000.039000.038000.038000.038000.034000.034000.034000.033000.033000.033000.032000.032000.029000.035000.0750.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302020-06-302017-03-312016-03-312015-03-312014-09-302014-06-302013-09-302013-06-30
Value605338383231314.4061.11425
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302020-06-302017-03-312016-03-312015-03-312014-09-302014-06-302013-09-302013-06-30
Value605338363231314.4060.6095
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-03-312012-09-30
Value6059535352525146454539383837373332323131304.4069.742.4
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value4.4114.4824.1374.2644.8414.3484.5084.7974.2244.3814.4014.0934.4284.4684.2784.5211.4934.2693.9164.1244.0844.3334.756210.02322
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:EmployeeStockOption


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value3.7393.7663.5463.684.2323.923.9954.1153.5193.6633.7183.4593.5413.5833.1933.5031.4583.3283.4773.6693.4593.5853.8443.6670.03.9613.352
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount84.884.085.786.387.490.288.685.883.383.684.584.580.080.274.677.597.778.088.889.084.782.780.817.20.017.214.8

us-gaap:StockCompensationPlan


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value0.0090.0090.0190.0130.0130.0230.0130.0130.0180.0120.0130.0190.0130.0150.0180.0130.0010.0190.0110.0080.0150.00.00.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.20.20.50.30.30.50.30.30.40.30.30.50.30.30.40.30.10.40.30.20.40.00.00.0

xlrn:RestrictedStockUnitsRSUsandPerformanceRestrictedStockUnitsPRSUs


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value0.6630.7070.5720.5320.5570.3660.4610.630.6480.6670.6310.5510.81
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount15.015.813.812.511.58.410.213.115.315.214.313.518.3

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302020-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1.05-0.34-0.62-0.65-0.77-0.66-0.51-0.55-0.590.14-0.81-0.36-0.32-0.45-0.55-0.25-0.52-0.3-0.64-5.621.2-0.96-28.4-23.28-23.72-6.0
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302020-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-1.05-0.34-0.62-0.65-0.77-0.66-0.51-0.55-0.590.13-0.81-0.36-0.32-0.45-0.55-0.25-0.52-0.3-0.64-5.621.12-0.96-28.4-23.28-23.72-6.0
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-03-312012-12-312012-09-30
Value-1.05-0.95-0.66-0.34-0.95-0.44-0.86-0.34-0.74-0.75-0.63-0.63-0.58-0.62-0.65-0.77-0.66-0.51-0.55-0.59-0.8-0.36-0.32-0.45-0.45-0.25-0.52-0.32.59-5.62-0.24-7.11-5.82
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-03-31
Value13158.4327.9867.146.6795.6855.3065.0126.9926.5076.4075.965.6966.3715.7069.5886.5830.54.5884.5514.2483.783.0642.662.5721.4511.1941.018
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.263.132.635.418.0153.814.5126.118.1251.5170.5196.7161.7176.2172.0189.3313.6177.714.8152.7142.423.399.473.746.558.238.834.030.8

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:ResearchAndDevelopmentExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5.8768.1584.1373.7943.2593.1412.3332.1072.0063.53.4053.3463.052.8693.9593.1733.4333.6622.5541.9421.851.8241.551.2011.0191.0830.7260.4860.4530.4
Percentage of AllocatedShareBasedCompensationExpense43.652.249.147.545.647.041.039.740.050.152.352.251.250.462.155.635.855.6510.842.340.742.941.039.238.342.150.040.70.039.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.033.016.016.88.272.35.950.17.3125.989.2102.782.888.8106.9105.3112.398.875.864.657.910.040.728.917.824.519.413.911.112.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ResearchAndDevelopmentExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SellingGeneralAndAdministrativeExpenses


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.6037.4684.2954.1923.8813.5383.3523.1993.0063.492
Percentage of AllocatedShareBasedCompensationExpense56.447.850.952.554.453.059.060.360.049.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.230.216.618.69.881.48.576.010.9125.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SellingGeneralAndAdministrativeExpenses0.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-63.513-63.6-57.458-39.387-18.29-51.206-23.683-45.398-17.41-37.785-34.57-28.662-28.658-26.648-28.568-25.351-29.623-25.382-19.592-21.144-21.7895.306-27.281-11.817-10.402-14.617-17.617-7.972-16.55-9.12-18.11-18.513131.647-10.379-7.215
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.9-222.1-174.6-46.0-1178.8-60.2-1078.8-62.9-1359.2-905.9-879.7-777.7-824.5-771.1-841.1-969.0-685.1-581.5-703.6-682.029.2-717.2-284.4-181.9-330.7-471.2-227.3-405.8-275.8-157.2-433.649.511.0-260.5-184.8

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value9188836158556453484340333330322832292523222221181819181421151411121112101010
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax327.9356.9322.7273.9147.61287.2165.01262.6176.41567.81064.51022.7911.6955.2872.9948.61078.4797.9752.6782.5715.2121.7576.2451.7329.0440.7489.2424.7524.5469.2130.0261.246.579.1305.6275.6270.9308.6

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-63513000.0-63466000.0-57405000.0-39234000.0-18447000.0-50924000.0-23579000.0-45403000.0-17906000.0-38033000.0-34771000.0-28991000.0-28927000.0-26209000.0-27867000.0-25492000.0-29663000.0-25401000.0-19245000.0-20790000.0-22016000.05061000.0-27082000.0-11858000.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.3-221.9-173.9-46.4-1172.3-59.9-1079.0-64.7-1368.1-911.2-889.8-785.0-810.9-752.1-845.8-970.3-685.6-571.2-691.8-689.127.8-711.9-285.4

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302012-09-30
Value8000.05000.0-10000.011000.04000.015000.0-4000.0-34000.0-44000.020000.0-36000.0-12000.011000.010000.061000.0-41000.06000.06000.044000.0-20000.00000000000000
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.00.00.00.3-0.0-0.8-0.20.7-0.9-0.40.30.31.6-1.40.20.21.3-0.70.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-63.521-63.471-57.396-39.245-18.451-50.939-23.575-45.369-17.862-38.053-34.734-28.979-28.938-26.219-27.926-25.451-29.669-25.407-19.288-20.77-22.0165.061-27.082-11.858-10.383-14.574-17.617-7.972-16.55-9.12-18.11-24.785131.647-10.379-13.962-7.4-7.588
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.4-221.9-174.0-46.4-1172.6-59.9-1078.2-64.6-1368.8-910.2-889.5-785.3-811.2-753.7-844.4-970.5-685.7-572.5-691.2-689.127.8-711.9-285.4-181.6-329.7-471.2-227.3-405.8-275.8-157.2-580.449.511.0-260.5-357.5-183.2-228.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-63.521-63.471-39.245-18.451-50.939-45.369-17.862-38.053-28.979-28.938-26.219
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.4-174.0-46.4-1172.6-1078.2-64.6-1368.8-889.5-785.3-811.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.1490.1370.189-0.0060.4660.6482.0023.523.232.7722.0351.0710.9791.4310.770.0860.2480.4572.742-0.282-2.3619.017-8.9662.7552.7110.485-3.0623.4190.7613.088-14.658-11.629-1.073-1.489-2.185-0.357
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.7-0.01.214.95.183.711.799.753.332.926.644.320.82.98.112.381.4-9.4-73.949.5-235.766.347.411.0-81.997.518.793.4-127.2-272.3-4.1-9.9-54.8-9.1

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-63.662-63.603-57.595-39.228-18.913-51.572-25.581-48.923-21.136-40.805-36.806-30.062-29.906-27.64-28.636-25.578-29.911-25.858-21.986-20.508-19.655-3.956-18.115-14.613-13.094-15.059-14.554-11.391-17.311-12.208-3.451-6.884143.136-8.194-6.858-6.904-6.933
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.9-256.9-222.7-173.9-47.6-1187.2-65.0-1162.6-76.4-1467.8-964.5-922.7-811.6-855.2-772.9-848.6-978.4-697.9-652.6-682.5-615.2-21.7-476.2-351.7-229.0-340.7-389.2-324.7-424.5-369.2-30.0-161.253.520.9-205.6-175.6-170.9-208.6

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value565757403837483734322924252325212121191716161613141414111211108.1438.9118.789.6738.722
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax200.9231.4221.3180.696.2867.0124.1894.2125.71178.8782.9757.1703.7725.0683.9698.7706.5586.4566.6569.1505.189.3424.4320.9247.5334.4389.9338.5310.9355.888.7190.733.758.5242.7223.4

us-gaap:ResearchAndDevelopmentExpense us-gaap:CounterpartyName

xlrn:LicenseAgreementWithAntibodyTechnologyCompany


Research
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.10.50.00.00.11.70.2
Percentage of ResearchAndDevelopmentExpense0.00.21.30.00.00.34.90.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.41.30.00.02.46.17.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:LicenseAgreementWithAntibodyTechnologyCompany0.00.00.00.00.00.00.00.0

xlrn:LicenseAgreementWithFulcrumTherapeutics


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.60.52.50.60.80.30.00.0
Percentage of ResearchAndDevelopmentExpense1.10.94.41.52.10.80.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.12.09.72.72.06.90.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:LicenseAgreementWithFulcrumTherapeutics0.00.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense us-gaap:CounterpartyName, us-gaap:TypeOfArrangement

xlrn:LicenseAgreementWithNonProfitInstitution, us-gaap:NoncollaborativeArrangementTransactions


Research
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-03-312013-03-31
Value-1.61.02.10.31.60.11.70.20.0570.0430.00.0-1.10.90.10.1-0.80.40.20.9-0.90.20.40.10.10.5
Percentage of ResearchAndDevelopmentExpense-2.82.55.50.83.30.34.90.60.20.20.00.0-4.34.30.50.5-4.22.31.25.5-5.61.52.80.70.85.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.24.45.36.94.12.46.17.21.51.30.00.0-29.729.93.32.7-23.713.36.34.9-23.74.87.02.33.03.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:LicenseAgreementWithNonProfitInstitution us-gaap:NoncollaborativeArrangementTransactions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value27242522394.344394.208272.783.8163.2583.6853.2323.7053.0143.0573.7053.3693.0053.195183.8044.1555.7174.423.7393.5084.0783.307114.2726153.9853.9054.043.324
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:Royalty


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value25222219111.520.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.890.588.985.427.935.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax91.890.588.985.427.935.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Royalty100.0100.0100.0100.0100.0100.00.00.0

xlrn:CostSharing


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2.2942.3622.8743.2983.6782.8244.3384.2082.6662.783.8163.2583.6853.2323.572.8792.922
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.29.511.114.69.365.011.0100.09.6100.0100.0100.0100.0100.096.495.595.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.29.511.114.69.365.011.0100.09.6100.0100.0100.0100.0100.096.495.595.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:CostSharing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:MilestoneRevenue


Revenue
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.0250.025
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.062.90.090.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.062.90.090.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:MilestoneRevenue0.0100.00.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value27242522394.344394.208272.783.8163.2583.6853.2323.7053.0143.0573.7053.3693.0053.195183.8044.1555.7174.423.7393.5084.0783.307114.2726153.9853.9054.043.324
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value35312621201816151410
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax127.0125.5101.393.351.4420.240.9368.450.7389.0

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:CounterpartyName, us-gaap:TypeOfArrangement

xlrn:LicenseAgreementWithNonProfitInstitution, us-gaap:NoncollaborativeArrangementTransactions


Selling
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.31.20.60.1
Percentage of SellingGeneralAndAdministrativeExpense3.73.92.90.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.74.81.52.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax xlrn:LicenseAgreementWithNonProfitInstitution us-gaap:NoncollaborativeArrangementTransactions0.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value83687593294747946450451955056031433835137038938120822924726227428914615816717518620021422312312749
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value736477525750555450492219181623221920223330293726282930334442655271
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.77.48.35.612.110.811.010.69.38.97.25.65.24.46.26.09.69.18.912.711.110.125.316.816.817.016.116.520.919.153.341.4145.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value83687593294747946450451955056031433835137038938120822924726227428914615816717518620021422312312749
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312011-12-312010-12-31
Value7638108558954214134494644995102923193333533653581882082252292432601091311391451561671691805774-290.973-232.691-248.817
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets91.392.691.794.487.989.289.089.490.791.192.894.494.895.693.894.090.490.991.187.388.989.974.783.283.283.083.983.579.180.946.758.6-591.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.409-0.417-0.288-0.225-0.083-0.2440.0230.1310.16-0.292-0.56
Percentage of StockholdersEquity-0.1-0.1-0.0-0.0-0.0-0.10.00.00.0-0.1-0.2
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.10.00.00.0-0.1-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1767175217321715120211761160115211421135879871858850839590416399250
Percentage of StockholdersEquity231.7216.1202.6191.6285.2284.3258.3247.9228.5222.4301.0273.1257.7240.4229.8261.7381.6255.8432.6
Percentage of Assets211.4200.1185.9181.0250.8253.4229.9221.8207.3202.6279.2257.8244.2229.9215.6238.4284.9214.6202.1
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value0.0610.060.060.060.0540.0530.0530.0540.0530.0530.0470.0470.0470.0460.0460.0390.0340.0330.0290.0030.0030.003
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncome


Stockholders
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-0.288-0.083-0.2440.0230.1310.16-0.292-0.56-0.764-1.044-1.324-0.895-0.425-0.220.0
Percentage of StockholdersEquity-0.0-0.0-0.10.00.00.0-0.1-0.2-0.2-0.3-0.4-0.2-0.2-0.20.0
Percentage of Assets-0.0-0.0-0.10.00.00.0-0.1-0.2-0.2-0.3-0.4-0.2-0.2-0.20.0
Percentage of Assets us-gaap:ComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value-1004.429-940.908-877.437-820.042-780.797-762.346-711.407-687.833-642.464-624.602-586.549-551.815-524.477-495.539-473.024-364.491-307.477-243.583-192.324-290.976-232.694-248.82
Percentage of StockholdersEquity-131.6-116.0-102.6-91.6-185.2-184.2-158.3-148.0-128.5-122.3-200.8-172.9-157.4-140.1-129.5-161.6-281.4-155.9-332.7100.0100.0100.0
Percentage of Assets-120.1-107.4-94.1-86.5-162.9-164.2-140.9-132.4-116.6-111.5-186.3-163.2-149.2-133.9-121.5-147.2-210.1-130.8-155.4-591.30.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value71773789391344843244944344544830631829930028534314814914614412717011012212110718219621021811912243
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets85.984.295.896.493.693.189.185.380.980.097.294.185.181.273.390.171.265.059.355.246.358.975.877.372.261.497.997.997.997.996.296.589.1

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-312010-12-31
Value336455670729283277237169163214144112796910023830332031366327433839176189204214113116283839496534
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.252.072.077.059.159.847.132.629.738.345.833.322.618.825.762.714.714.58.511.813.522.019.027.422.822.794.794.395.296.091.591.50.00.080.50.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value337457672731285279239171165216145114807010124031342128
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.452.272.177.259.560.147.432.930.038.646.333.723.019.226.063.015.315.08.819.5

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2872311781521061361932562672231471952082221779811110811810783100777275610.0
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets34.326.519.216.122.229.538.449.448.539.846.857.859.360.045.525.853.647.247.940.830.534.852.745.745.234.90.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value6625178.854199.28410.0109.5087.8977.6627.0937.5175.2034.4463.3343.1114.0863.8623.6763.0813.1652.4582.5361.7732.5762.483.9472.181.6852.2432.1791.474
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.02.91.90.94.02.02.02.01.71.42.42.12.11.41.10.91.51.81.61.41.11.11.71.61.11.51.32.01.00.81.81.73.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value403835312623222323
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.47.511.28.110.915.912.018.946.8

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ConstructionInProgress


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1.6281.1811.1390.5840.8490.390.0110.00.008
Percentage of PropertyPlantAndEquipmentGross4.03.13.21.93.11.70.00.00.0
Percentage of Assets0.20.20.40.20.30.30.00.00.0
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value12121111119.999.939.9310
Percentage of PropertyPlantAndEquipmentGross31.732.533.236.741.342.944.342.543.8
Percentage of Assets1.42.43.73.04.56.85.38.020.5
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.0

us-gaap:OfficeEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value0.770.6720.6720.5220.5190.260.2130.2050.179
Percentage of PropertyPlantAndEquipmentGross1.91.81.91.71.91.11.00.90.8
Percentage of Assets0.10.10.20.10.20.20.10.20.4
Percentage of Assets us-gaap:OfficeEquipment0.00.00.00.00.00.00.00.00.0

xlrn:ComputerEquipmentAndSoftware


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1.7861.7671.7121.5011.261.1630.9560.9210.919
Percentage of PropertyPlantAndEquipmentGross4.44.64.94.84.75.04.33.94.0
Percentage of Assets0.20.30.50.40.50.80.50.71.9
Percentage of Assets xlrn:ComputerEquipmentAndSoftware0.00.00.00.00.00.00.00.00.0

xlrn:LaboratoryEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value232219171311111211
Percentage of PropertyPlantAndEquipmentGross58.158.056.855.049.049.350.452.751.3
Percentage of Assets2.54.46.34.45.37.86.110.024.0
Percentage of Assets xlrn:LaboratoryEquipment0.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value333128242120191918
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.56.28.96.38.813.810.415.938.5

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value8580000.07856000.07768000.07621000.07671000.06668000.06812000.06852000.06775000.07027000.07106000.06270000.06868000.07019000.06966000.07211000.07210000.07107000.05201000.04215000.04190000.03724000.03106000.02945000.02902000.02949000.03087000.03379000.03581000.03674000.03705000.03564000.04059000.0
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.90.80.81.61.41.31.31.21.32.31.92.01.91.81.93.53.12.11.61.51.32.11.91.71.71.71.71.71.63.02.88.2

Long Term Investments

us-gaap:LongTermInvestments

us-gaap:LongTermInvestments


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value891087.5854.9990.01.123224270750.01144619529517194112141114313242630.0
Percentage of LongTermInvestments100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets10.712.40.80.50.00.24.58.112.713.50.03.512.616.624.67.724.831.438.242.951.839.421.320.425.536.40.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18202119212223252627
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.32.42.14.44.94.74.94.85.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

xlrn:A125SidneyStreet


Operating
Period End2020-10-16
Value3.8
Percentage of OperatingLeaseRightOfUseAsset0.0
Percentage of Assets0.0
Percentage of Assets xlrn:A125SidneyStreet0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302012-12-31
Value1706000.01717000.01727000.01708000.01698000.01681000.01793000.0219000.076000.0107000.0105000.092000.097000.0105000.0113000.0124000.091000.020000.022000.06000.08000.07000.0368000.043000.060000.069000.000092000.022000.0146000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.40.40.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.10.00.3

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value9.4384.4638.4728.861123.9292.2951.8543.5483.930.4191.2891.2691.6771.0861.0241.6610.9111.592.0710.5661.2020.8752.6471.791.5670.7243.3142.6142.2950.8850.8910.642
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.10.50.90.92.70.80.50.40.60.70.10.40.40.50.30.30.80.40.60.80.20.40.61.71.10.90.41.71.21.00.70.71.3

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value42384421171824231613181313111414111213121112128.9688.3776.6926.8485.9386.4754.6596.9275.1266.153
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.14.34.82.33.73.94.94.63.02.55.83.93.73.03.83.75.55.75.34.94.34.48.55.75.03.83.73.03.02.15.64.012.5

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value594960373728333126231814141216151415161613151412119.7829.25311169.188271638
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.15.76.53.97.86.16.66.14.74.26.04.34.13.54.34.26.96.66.56.25.05.29.98.16.85.65.05.57.54.122.013.078.8

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value7552000.07282000.07010000.06524000.06467000.06412000.06183000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.80.80.71.31.41.2

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302016-12-312015-12-312014-12-312013-12-312012-12-31
Value755000.0997000.01118000.02930000.017000.02432000.02713000.01081000.01650000.0816000.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.20.40.80.01.01.90.61.31.7

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302019-09-302019-06-302018-12-31
Value373000.048000.0119000.00
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.00.0
Percentage of Assets0.00.00.00.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value13151715161820
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.71.81.63.54.04.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value9235000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets1.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value7296000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.8

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value867000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value888000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value373000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2426272930
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets2.65.25.45.35.4

us-gaap:OperatingLeaseLiability us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Operating
Period End2020-10-16
Value4.1
Percentage of OperatingLeaseLiability0.0
Percentage of Assets0.0
Percentage of Assets us-gaap:SubsequentEvent0.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value27
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets3.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value3508000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312011-12-312010-12-31
Value7638108558954214134494644995102923193333533653581882082252292432601091311391451561671691805774-290.973-232.691-248.817
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets91.392.691.794.487.989.289.089.490.791.192.894.494.895.693.894.090.490.991.187.388.989.974.783.283.283.083.983.579.180.946.758.6-591.30.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.409-0.417-0.288-0.225-0.083-0.2440.0230.1310.16-0.292-0.56
Percentage of StockholdersEquity-0.1-0.1-0.0-0.0-0.0-0.10.00.00.0-0.1-0.2
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.10.00.00.0-0.1-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1767175217321715120211761160115211421135879871858850839590416399250
Percentage of StockholdersEquity231.7216.1202.6191.6285.2284.3258.3247.9228.5222.4301.0273.1257.7240.4229.8261.7381.6255.8432.6
Percentage of Assets211.4200.1185.9181.0250.8253.4229.9221.8207.3202.6279.2257.8244.2229.9215.6238.4284.9214.6202.1
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value0.0610.060.060.060.0540.0530.0530.0540.0530.0530.0470.0470.0470.0460.0460.0390.0340.0330.0290.0030.0030.003
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncome


Stockholders
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-0.288-0.083-0.2440.0230.1310.16-0.292-0.56-0.764-1.044-1.324-0.895-0.425-0.220.0
Percentage of StockholdersEquity-0.0-0.0-0.10.00.00.0-0.1-0.2-0.2-0.3-0.4-0.2-0.2-0.20.0
Percentage of Assets-0.0-0.0-0.10.00.00.0-0.1-0.2-0.2-0.3-0.4-0.2-0.2-0.20.0
Percentage of Assets us-gaap:ComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value-1004.429-940.908-877.437-820.042-780.797-762.346-711.407-687.833-642.464-624.602-586.549-551.815-524.477-495.539-473.024-364.491-307.477-243.583-192.324-290.976-232.694-248.82
Percentage of StockholdersEquity-131.6-116.0-102.6-91.6-185.2-184.2-158.3-148.0-128.5-122.3-200.8-172.9-157.4-140.1-129.5-161.6-281.4-155.9-332.7100.0100.0100.0
Percentage of Assets-120.1-107.4-94.1-86.5-162.9-164.2-140.9-132.4-116.6-111.5-186.3-163.2-149.2-133.9-121.5-147.2-210.1-130.8-155.4-591.30.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value61000.060000.060000.060000.054000.053000.053000.054000.053000.053000.047000.047000.047000.046000.046000.045000.039000.039000.039000.038000.038000.038000.034000.034000.034000.033000.033000.033000.032000.032000.029000.035000.0750.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1767175217321715120211761160115211421135879871858850839803608598590574567562416412407403399393387381250
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets211.4200.1185.9181.0250.8253.4229.9221.8207.3202.6279.2257.8244.2229.9215.6210.8291.9261.3238.4218.7207.1194.3284.9260.2243.5230.1214.6196.1180.7171.2202.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value-1004400000.0-940910000.0-877440000.0-820040000.0-780800000.0-762350000.0-711410000.0-687830000.0-642460000.0-624600000.0-586550000.0-551820000.0-524480000.0-495540000.0-473020000.0-445100000.0-419650000.0-389980000.0-364490000.0-345200000.0-324430000.0-302420000.0-307480000.0-280400000.0-268540000.0-258160000.0-243580000.0-225970000.0-218000000.0-201440000.0-192320000.0-174220000.0-290980000.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-120.1-107.4-94.1-86.5-162.9-164.2-140.9-132.4-116.6-111.5-186.3-163.2-149.2-133.9-121.5-116.7-201.3-170.2-147.2-131.3-118.3-104.4-210.1-177.0-160.3-147.0-130.8-112.6-101.6-90.3-155.4-136.9-591.3

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-409000.0-417000.0-288000.0-225000.0-83000.0-244000.023000.0131000.0160000.0-292000.0-560000.0-763000.0-1043000.0-1324000.0-895000.0-314000.0-354000.0-400000.0-425000.0-122000.0252000.025000.0-220000.0-21000.0-62000.0-43000.00
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.10.00.00.0-0.1-0.2-0.2-0.3-0.4-0.2-0.1-0.2-0.2-0.2-0.00.10.0-0.2-0.0-0.0-0.00.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2020-09-302019-03-31
Value492248
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0
Percentage of Assets0.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-302019-03-31
Value492248
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0
Percentage of Assets0.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value13157.9867.146.6795.3065.0126.9926.4075.9595.696
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value13157.9867.146.6795.3065.0126.9926.4075.9595.696
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-84415000.0-67924000.0-38130000.0-2796000.0-42856000.0-46545000.0-16251000.0-37045000.0-14200000.0-26308000.0-29028000.0-20096000.0-22151000.0-23431000.0-20802000.0-16818000.0-17161000.0-21949000.0-16740000.0-13022000.0-15872000.0939000.0-12461000.0-8977000.0-8948000.0-13825000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-302.1-274.4-147.4-12.4-107.8-1071.5-41.3-880.3-51.3-946.3-760.7-616.8-601.1-725.0-561.5-558.0-561.4-592.4-496.9-433.3-496.85.2-327.6-216.1-156.5-312.8

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-37.134-151.213-29.6-52.2329778137-38.415-152.57594529-11.921-146.4833414324.8864.489-11.263-106.917-4.122136.406-124.374
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-132.9-610.8-114.4-231.575.31783.6207.7902.6-138.9-5488.11566.21384.3813.6-368.8-3953.71161.2473.8880.8145.0149.4-352.5-587.4-108.4315.7112.1-2813.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.2353.6988.997501188.8732.6734.9971.7342490.8868.2972.0254.938281900.2471.5211.7882.5540.4491410.9281.140.8841.553
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.014.934.82221.547.7204.36.8118.86.38968.223.2254.755.0152.8768.66305.68.141.153.185.014.1779.524.427.415.535.1

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-119.314-215.439-58.7334466.03539685.933-50.8817031339.856-30.414-138.809208-2.43112
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-427.0-870.2-227.11977.615.2916.4173.2141.0-183.92533.7828.71022.1267.5-941.0-3746.56908.9-79.5334.5

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1036000.01026000.01004000.0903000.0942000.0996000.01009000.0990000.0-226000.02168000.0879000.01002000.0962000.0904000.0802000.0799000.0683000.0541000.0518000.0443000.0391000.0324000.0305000.0297000.0283000.0291000.0286000.0290000.0277000.0265000.0234000.0232000.0225000.0224000.0207000.0
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value4.72-4.178-0.485-4.0198.71.6340.441-1.694-0.3373.466-0.753-0.103-0.4080.5910.062-0.6370.849-0.778-0.5521.505-0.267-0.042-1.7720.8570.2230.843-2.590.70.3191.41-0.296-0.0710.561-0.247-0.378
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value000-17000.0-10000.0-15000.042000.00-124000.0-186000.0-202000.0-153000.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet0.00.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-84415000.0-67924000.0-38130000.0-2796000.0-42856000.0-46545000.0-16251000.0-37045000.0-14200000.0-26308000.0-29028000.0-20096000.0-22151000.0-23431000.0-20802000.0-16818000.0-17161000.0-21949000.0-16740000.0-13022000.0-15872000.0939000.0-12461000.0-8977000.0-8948000.0-13825000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-302.1-274.4-147.4-12.4-107.8-1071.5-41.3-880.3-51.3-946.3-760.7-616.8-601.1-725.0-561.5-558.0-561.4-592.4-496.9-433.3-496.85.2-327.6-216.1-156.5-312.8

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-63.521-63.471-57.396-39.245-18.451-50.939-23.575-45.369-17.862-38.053-34.734-28.979-28.938-26.219-27.926-25.451-29.669-25.407-19.288-20.77-22.0165.061-27.082-11.858-10.383-14.574-17.617-7.972-16.55-9.12-18.11-24.785131.647-10.379-13.962-7.4-7.588
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.4-221.9-174.0-46.4-1172.6-59.9-1078.2-64.6-1368.8-910.2-889.5-785.3-811.2-753.7-844.4-970.5-685.7-572.5-691.2-689.127.8-711.9-285.4-181.6-329.7-471.2-227.3-405.8-275.8-157.2-580.449.511.0-260.5-357.5-183.2-228.3

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-63.521-63.471-39.245-18.451-50.939-45.369-17.862-38.053-28.979-28.938-26.219
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-227.3-256.4-174.0-46.4-1172.6-1078.2-64.6-1368.8-889.5-785.3-811.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value13158.4327.9867.146.6795.6855.3065.0126.9926.5076.4075.9595.6966.3715.7059.5896.5835.174.5874.5524.2483.783.0642.662.5721.4511.21.1141.0180.7550.50.520.4280.345
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-37.134-151.213-29.6-52.2329778137-38.415-152.57594529-11.921-146.4833414324.8864.489-11.263-106.917-4.122136.406-124.374
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-132.9-610.8-114.4-231.575.31783.6207.7902.6-138.9-5488.11566.21384.3813.6-368.8-3953.71161.2473.8880.8145.0149.4-352.5-587.4-108.4315.7112.1-2813.9

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value969000.0920000.0900000.0883000.01994000.0426000.01121000.0893000.0686000.0587000.0689000.0528000.0869000.0504000.0757000.0711000.02251000.0677000.01134000.0686000.01071000.0489000.0300000.0415000.086000.0158000.016000.0119000.0229000.0150000.0120000.062000.045000.080000.0119000.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.2353.6988.997501188.8732.6734.9971.7342490.8868.2972.0254.938281900.2471.5211.7882.5540.4491410.9281.140.8841.553
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.014.934.82221.547.7204.36.8118.86.38968.223.2254.755.0152.8768.66305.68.141.153.185.014.1779.524.427.415.535.1

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-312015-12-312015-06-302015-03-312014-12-312013-12-31
Value3739000.03766000.03378000.03546000.03680000.04232000.03820000.03920000.03513000.03452000.03316000.03191000.03477000.03669000.03210000.03942000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312017-12-312016-12-312015-12-312015-06-302015-03-312014-12-31
Value62.3960.2249.7845.1942.9440.2536.2636.1734.429.1425.9618.8517.5716.819.77
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value17000.0180000.029000.061000.017000.0197000.052000.030000.021000.0113000.0239000.0-208000.0108000.0100000.027000.08000.09000.0112000.063000.062000.0-1000.097000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value083000.000078000.000000000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.046.10.00.00.039.60.00.00.00.00.0-0.00.00.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value282225182145136109896668
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value421000.0205000.0298000.0-71000.0-73000.0425000.0-68000.0174000.071000.0267000.01026000.0-123000.0-58000.0314000.0-201000.090000.0-1464000.01769000.0372000.0-233000.0-195000.0453000.0188000.0-75000.0149000.08000.04000.0-32000.0-44000.083000.0297000.00
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:EmployeeBenefitsAndShareBasedCompensation


Employee
Period End2021-06-30
Value1900000.0
Percentage of EmployeeBenefitsAndShareBasedCompensation100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value3.746-3.5330.2121.4480.53-0.063-0.2180.116-0.540.3420.369-0.1190.2920.40.20.045-2.2360.82.9-8.6839.123-2.616-2.557-0.4223.087-3.394-0.74-3.9914110.4331.0671.694-0.132
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value4.252-6.643223.9730.15-7.1481.1266.8762.8-4.5443.7670.2772.093-4.2331.3332.345-0.234-1.9510.1350.914-0.6540.1292.9390.6641.537-0.1640.906-0.5051.86-2.2782.3110.404-1.262-0.7440.928
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDueFromRelatedPartiesCurrent

us-gaap:IncreaseDecreaseInDueFromRelatedPartiesCurrent


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2.73-0.8943.54-17.19131-0.1121.6721.4282.667-4.2593.782-0.4110.437-0.3380.691-0.002-0.6890.3360.215-0.220.182-0.571
Percentage of IncreaseDecreaseInDueFromRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value417.8828.429-10.52410-0.828-1.3021.2231.580.9280.36-0.4292.3060.7491.1010.256-0.9040.2220.20.592-0.080.699-0.1060.747-0.8140.166-1.4681.7670.495-0.5390.0610.8-0.310.272-0.729
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasesRentExpenseNet us-gaap:Range, us-gaap:SubsequentEventType

us-gaap:OperatingLeasesRentExpenseNet

srt:Maximum, us-gaap:SubsequentEvent


Operating
Period End2020-10-16
Value71800.0
Percentage of OperatingLeasesRentExpenseNet100.0

srt:Minimum, us-gaap:SubsequentEvent


Operating
Period End2020-10-16
Value65000.0
Percentage of OperatingLeasesRentExpenseNet90.5

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8000.0-129000.0-63000.0-142000.0161000.0-267000.0-108000.0-29000.0452000.0268000.0165000.0317000.0280000.0-429000.0-640000.0100000.046000.025000.0-303000.0-374000.0227000.0245000.0-199000.041000.0-19000.0-43000.00000
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value8000.0-129000.0-142000.0161000.0-267000.0-29000.0452000.0268000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value241000.03218000.0174000.011000.0-198000.0-1365000.0-203000.0479000.0555000.0-959000.0135000.067000.0-352000.0-207000.035000.0-66000.0-57000.0-88000.0-254000.0-159000.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfStockIssuanceCosts

us-gaap:PaymentsOfStockIssuanceCosts


Payments
Period End2020-09-302019-03-31
Value505000.0500000.0
Percentage of PaymentsOfStockIssuanceCosts100.0100.0

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:PaymentsToAcquireMarketableSecurities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value1112707610348101685772160.07.45730351790.07-0.0460.22185-28.233351251.6198.4931240.00.00.0
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ProceedsFromCollaborators us-gaap:ProductOrService, us-gaap:TypeOfArrangement

us-gaap:ProceedsFromCollaborators

xlrn:REBLOZYLAgreement, xlrn:CollaborationLicenseandOptionAgreement


Proceeds
Period End2021-06-302021-03-312020-09-30
Value2528214
Percentage of ProceedsFromCollaborators100.0100.0100.0

xlrn:Sotatercept, xlrn:CollaborationLicenseandOptionAgreement


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.1452110.00.144
Percentage of ProceedsFromCollaborators0.415.90.00.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-02-122019-01-182019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-252017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.04920.00.00.00.0-0.0252482152480.00.00.00.0271871870.00.00.00.306-0.3691400.5890.00.00.0
Percentage of ProceedsFromIssuanceOfCommonStock0.0100.00.00.00.00.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.00.00.00.0100.0100.0100.0100.00.00.00.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7511947518088981244064605361243335163391-23.0582519-3.45315140.0
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockConsiderationReceivedOnTransaction

xlrn:PublicStockOffering


Sale
Period End2020-07-062019-01-18
Value492248
Percentage of SaleOfStockConsiderationReceivedOnTransaction100.0100.0

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockNumberOfSharesIssuedInTransaction

us-gaap:SubsequentEvent, us-gaap:OverAllotmentOption


Sale
Period End2020-07-06
Value729730.0
Percentage of SaleOfStockNumberOfSharesIssuedInTransaction100.0

us-gaap:SubsequentEvent, xlrn:PublicStockOffering


Sale
Period End2020-07-06
Value5594600.0
Percentage of SaleOfStockNumberOfSharesIssuedInTransaction766.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8000.07000.05000.07000.05000.026000.010000.06000.044000.07000.030000.0-8000.08000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value02000.00003000.01000.08000.0000018000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod0.028.60.00.00.011.510.0133.30.00.00.0-0.0225.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.2875.170.20.231.2141.36-0.28-0.885.4235.99-0.09-0.03-5.040.61
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value052.9900052.99031.09000031.090
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue0.070.50.00.00.0128.1-0.0-3533.00.00.0-0.0-0.0-621.80.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.15116.34.4210.22.9454.31-0.70.410.0241.70.031.47-3.340.63
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0115.5300052.9900000000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.099.30.00.00.097.6-0.00.00.00.00.00.0-0.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value53000.0116000.027000.014000.037000.086000.011000.025000.04000.084000.0104000.0-70000.0070000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2.6448.69-0.020.88-0.9338.690.45-0.290.2334.20.050.27031.26
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:EmployeeStockOption


Share
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value57.70.5790.5510.5740.5830.5910.6290.6220.630.6510.6580.6590.6540.6450.6440.660.6680.6710.707
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:EmployeeStockOption


Share
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value0.40.0040.0160.0160.0220.0260.0280.0280.0260.0190.0190.0220.0120.0150.0140.0170.0160.0170.019
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue


Share
Period End2021-06-302021-03-31
Value9.213
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod


Share
Period End2021-06-302021-03-31
Value26000.035000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-31
Value7.3970.11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross


Share
Period End2021-06-302021-03-312020-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value99000.0573000.0165000.051004.0173860.079550.0637580.031816.075775.026700.0566710.0406930.056830.026995.0555240.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value0.639.17-0.03
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-31
Value1.86116.856.92
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value100000.0150000.0313000.0230000.0617000.0296000.088000.035519.043044.0302330.075942.0358680.032158.0108860.040443.0292540.0279440.0358830.0157840.088891.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-31
Value1721000.0804000.0860000.0504000.0788000.0421000.0662000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-31
Value1721000.0804000.0860000.0504000.0788000.0421000.0662000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1818000.0-3888000.0-313000.0-663000.0-472000.0-252000.00-393000.0-363000.00-363000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1819000.0-3888000.0-313000.0-663000.0-472000.0-252000.00-393000.0-363000.00-363000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures100.1100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-30
Value1000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures-0.1

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.0555.8658.284198.4854.7441.760.7668.242.0274.716
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.0555.8658.284198.4854.7431.760.7668.242.0264.715
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:IncreaseDecreaseInNonCashLeaseExpense

xlrn:IncreaseDecreaseInNonCashLeaseExpense


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1615000.01574000.01520000.01457000.01415000.01377000.01339000.01302000.01268000.01234000.000
Percentage of IncreaseDecreaseInNonCashLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

xlrn:IncreaseDecreaseOperatingLeaseLiability

xlrn:IncreaseDecreaseOperatingLeaseLiability


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1706000.01652000.01623000.01556000.01511000.01466000.02119000.01340000.0557000.01317000.0
Percentage of IncreaseDecreaseOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:NetProceedsFromStockOptionsStockAwardsEmployeeStockPurchasePlanAndWarrantsExercised

xlrn:NetProceedsFromStockOptionsStockAwardsEmployeeStockPurchasePlanAndWarrantsExercised


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.2353.6988.9978.776188.8732.6734.9971.7591.1610.9478.2972.0255.016
Percentage of NetProceedsFromStockOptionsStockAwardsEmployeeStockPurchasePlanAndWarrantsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis

xlrn:StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis


Stock
Period End2020-09-30
Value3729000.0
Percentage of StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis100.0

xlrn:StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-30
Value3729000.0
Percentage of StockIssuedDuringPeriodValueWarrantsExerciseOnNetBasis100.0

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedProfessionalFeesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1276000.0976000.0621000.01183000.0739000.01198000.0426000.01017000.0607000.0
Percentage of AccruedProfessionalFeesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedRoyaltiesCurrentAndNoncurrent

us-gaap:AccruedRoyaltiesCurrentAndNoncurrent


Accrued
Period End2020-12-31
Value1191000.0
Percentage of AccruedRoyaltiesCurrentAndNoncurrent100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:CertificatesOfDeposit, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.2460.2490.2480.4931.2192.2032.2041.7153.8616.2568.855121012162331302916141410
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CollateralizedMortgageObligations, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value4.9981226676713
Percentage of AssetsFairValueDisclosure2031.72529.41567.0554.5289.278.9

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value60601011381281588867
Percentage of AssetsFairValueDisclosure24789.424490.840778.228066.77517.21297.4378.6403.6

us-gaap:MoneyMarketFunds, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value2662322391931049413674617251902242631192635462440253016918119921310111636
Percentage of AssetsFairValueDisclosure108358.593406.496674.639323.98559.14267.86194.24316.21594.41154.6586.9740.82037.4210.5194.984.885.4114.4157.4147.9289.7172.3288.30.00.00.00.00.00.00.0

us-gaap:USTreasurySecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value2158356373310
Percentage of AssetsFairValueDisclosure87524.417001.83322.3308.8145.365.5

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:CertificatesOfDeposit, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.2460.2490.2480.4931.2192.2032.2041.7153.8616.2568.855121012162331302916141410
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CollateralizedMortgageObligations, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value4.9981226676713
Percentage of AssetsFairValueDisclosure2031.72529.41567.0554.5289.278.9

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value60601011381281588867
Percentage of AssetsFairValueDisclosure24789.424490.840778.228066.77517.21297.4378.6403.6

us-gaap:MoneyMarketFunds, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value26623223919310494136746172519022426311926354624402530169
Percentage of AssetsFairValueDisclosure108358.593406.496674.639323.98559.14267.86194.24316.21594.41154.6586.9740.82037.4210.5194.984.885.4114.4157.4147.9289.7172.3288.30.0

us-gaap:USTreasurySecurities, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value2158356373310
Percentage of AssetsFairValueDisclosure87524.417001.83322.3308.8145.365.5

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value2883962661862322391931049413675637353912252732202736472541263117018220021410211737
Percentage of AssetsFairValueDisclosure0.00.0108358.50.093406.496674.639323.98559.14267.86194.24409.31635.81172.7599.7750.02047.7219.6201.888.888.5117.6160.8152.6295.3178.4296.90.00.00.00.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value3763512811711251462353523743492142502522962761271631802132202272151081041251310.00.00.00.0
Percentage of AssetsFairValueDisclosure0.00.0114445.50.050315.358899.647698.028911.917014.415838.412506.56482.24038.83345.52260.71160.71310.51102.6913.2707.8737.9732.3648.0741.6843.11255.40.00.00.00.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value665747548358357385429456468485290313326349368352190213234248264263134146152163170
Percentage of AssetsFairValueDisclosure0.00.0222804.10.0143721.7155574.287021.937471.021282.222032.616915.98117.95211.43945.23010.73208.41530.11304.41002.0796.2855.5893.1800.61036.91021.51552.30.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value26000.010000.09000.067000.0199000.0208000.0325000.0464000.0510000.093000.00000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1000.02000.04000.03000.03000.04000.03000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax11.13.02.01.40.90.90.60.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value21000.04000.05000.057000.0162000.056000.0219000.0331000.0323000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax80.840.055.685.181.426.967.471.363.30.0

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value5000.06000.03000.08000.033000.0147000.098000.0122000.0156000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax19.260.033.311.916.670.730.226.330.60.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value161000.0152000.022000.018000.09000.0181000.028000.042000.043000.0206000.0454000.0710000.01042000.0895000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Available
Period End2020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value2000.01000.0012000.012000.013000.0108000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax9.15.60.042.928.630.223.8

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value160000.0144000.013000.01000.06000.0181000.015000.027000.023000.0267000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax99.494.759.15.666.7100.053.664.353.558.8

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1000.08000.07000.016000.03000.001000.03000.07000.079000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.65.331.888.933.30.03.67.116.317.4

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value376340186157106138215298336298147208253273
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Available
Period End2020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value5.05.08.012296626
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.73.25.85.89.819.718.3

us-gaap:CertificatesOfDeposit


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.2450.2450.2450.2450.490.9751.9551.715
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.10.20.20.20.20.30.61.2

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3242654539569712414216673
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis86.278.024.724.853.670.557.847.949.649.9

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value527413511349327812510145
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis13.822.072.571.846.223.636.242.030.230.7

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value376339186157106138216298337298147207252272
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value288396266186193
Percentage of AvailableForSaleSecuritiesDebtSecurities76.7116.5142.9118.289.7

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities


Available
Period End2020-12-312020-09-302019-12-31
Value4.9984.99912
Percentage of AvailableForSaleSecuritiesDebtSecurities2.73.25.8

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit


Available
Period End2020-12-312020-09-302019-12-31
Value0.2460.2470.493
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.2

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value3242766043138
Percentage of AvailableForSaleSecuritiesDebtSecurities86.181.332.727.564.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value527421512383
Percentage of AvailableForSaleSecuritiesDebtSecurities13.922.0115.478.138.8

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:AssetBackedSecurities


Available
Period End2020-12-312020-09-302019-12-31
Value4.9984.99912
Percentage of AvailableForSaleSecuritiesDebtSecurities2.73.25.8

us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit


Available
Period End2020-12-312020-09-302019-12-31
Value0.2460.2470.493
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.2

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value3242766043138
Percentage of AvailableForSaleSecuritiesDebtSecurities86.181.332.727.564.0

us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value288396266186193
Percentage of AvailableForSaleSecuritiesDebtSecurities76.7116.5142.9118.289.7

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value527421512383
Percentage of AvailableForSaleSecuritiesDebtSecurities13.922.0115.478.138.8

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Available
Period End2020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value4.9984.9998.00212296626
Percentage of AvailableForSaleSecuritiesDebtSecurities2.73.25.85.89.819.618.2

us-gaap:CertificatesOfDeposit


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.2460.2470.2490.2480.4930.9791.9581.715
Percentage of AvailableForSaleSecuritiesDebtSecurities0.10.20.20.20.20.30.61.2

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3242654539569712414316773
Percentage of AvailableForSaleSecuritiesDebtSecurities86.178.024.624.953.670.357.847.949.649.8

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value527413511349327812510145
Percentage of AvailableForSaleSecuritiesDebtSecurities13.922.072.571.846.223.736.242.030.230.7

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value3434323231303030
Percentage of CommonStockCapitalSharesReservedForFutureIssuance100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:AwardType

us-gaap:EmployeeStockOption


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5.4364.6343.5562.7631.997
Percentage of CommonStockCapitalSharesReservedForFutureIssuance15.813.610.88.66.4

us-gaap:RestrictedStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.5690.3970.6080.6040.732
Percentage of CommonStockCapitalSharesReservedForFutureIssuance1.71.21.81.92.3

us-gaap:StockCompensationPlan


Common
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.3783.823.5133.452
Percentage of CommonStockCapitalSharesReservedForFutureIssuance9.811.210.710.8

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:PlanName, us-gaap:SubsidiarySaleOfStock

xlrn:A2013ESPP, us-gaap:EmployeeStock


Common
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.0870.1230.1559480.186844
Percentage of CommonStockCapitalSharesReservedForFutureIssuance0.30.40.50.6

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.1610.1520.0220.0180.0090.18135591513851155199193
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Debt
Period End2020-12-31
Value0.002
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months9.1

us-gaap:Bonds


Debt
Period End2020-09-30
Value0.001
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months5.6

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.160.1440.0130.0010.0060.181
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months99.494.759.15.666.7100.0

us-gaap:MortgageBackedSecurities


Debt
Period End2020-12-31
Value0.002
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months9.1

us-gaap:USGovernmentAgenciesDebtSecurities


Debt
Period End2020-09-302020-06-30
Value0.0160.003
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months88.933.3

us-gaap:USTreasurySecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value0.0010.0080.007
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months0.65.331.8

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value2512491321257150
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Debt
Period End2020-12-31
Value4.998
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition3.8

us-gaap:Bonds


Debt
Period End2020-09-30
Value4.999
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition4.0

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value23922954182150
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition95.292.241.515.029.9100.0

us-gaap:MortgageBackedSecurities


Debt
Period End2020-12-31
Value4.998
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition3.8

us-gaap:USGovernmentAgenciesDebtSecurities


Debt
Period End2020-09-302020-06-30
Value10149
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition81.170.1

us-gaap:USTreasurySecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value121972
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition4.87.854.8

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value288232182145136109896668
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value23318414911610990755135
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:InternalRevenueServiceIRS


Deferred
Period End2020-12-312019-12-31
Value433228
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration100.0100.0

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-312019-12-31
Value0.60.4
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration0.10.2

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:StateAndLocalJurisdiction


Deferred
Period End2020-12-312019-12-31
Value787689
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value282116129.7177.8646.7045.5195.384
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsResearch100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-31
Value121413
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-31
Value7013000.05584000.03626000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements


Deferred
Period End2020-12-312019-12-31
Value5961000.06429000.0
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.0

us-gaap:DueFromRelatedPartiesCurrent

us-gaap:DueFromRelatedPartiesCurrent


Due
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value27252622398.4358.5476.8755.4472.787.0393.2583.6693.2323.572.8792.8813.573.2343.628
Percentage of DueFromRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value179.9327.9756.8094.843.5513.052.932.448
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value333520171810101211118.9
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:PerformanceBasedRestrictedStockUnits


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value11134.04.04.04.00.00.20.42.22.83.8
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions34.737.40.019.323.022.00.01.93.220.024.842.7

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:TitleOfIndividual, us-gaap:AwardType

xlrn:CertainIndividuals, us-gaap:RestrictedStockUnitsRSU


Employee
Period End2020-12-31
Value21
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions0.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions


Employee
Period End2021-06-302021-03-312020-09-30
Value707144
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions us-gaap:PlanName

xlrn:StockOptionAndRestrictedStockPlan2003AndEquityIncentivePlan2013


Employee
Period End2020-12-31
Value47
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions0.0

us-gaap:InterestReceivable

us-gaap:InterestReceivable


Interest
Period End2021-03-312020-12-312019-12-31
Value1200000.0300000.01100000.0
Percentage of InterestReceivable100.0100.0100.0

us-gaap:InterestReceivableCurrent

us-gaap:InterestReceivableCurrent


Interest
Period End2021-06-302020-12-31
Value1800000.0300000.0
Percentage of InterestReceivableCurrent100.0100.0

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseDiscountRate


Lessee
Period End2020-12-31
Value10.0
Percentage of LesseeOperatingLeaseDiscountRate100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value8926000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners us-gaap:Ownership, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

xlrn:BristolMyersSquibbCompanyBMSformerlyCelgene, xlrn:BristolMyersSquibbCompanyBMSformerlyCelgene


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value10.710.710.810.90.1180.1180.120.122
Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value9.5910.59
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:InternalRevenueServiceIRS


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value87166655643833927621114193
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value78868951539329322916512275
Percentage of OperatingLossCarryforwards90.5103.592.689.986.683.278.187.280.8

us-gaap:OtherPrepaidExpenseCurrent

us-gaap:OtherPrepaidExpenseCurrent


Other
Period End2021-06-302020-12-31
Value5803000.08990000.0
Percentage of OtherPrepaidExpenseCurrent100.0100.0

us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashAndCashEquivalents


Restricted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-31
Value1597000.01597000.01597000.01597000.01597000.01597000.01597000.01597000.01597000.01597000.01132000.01132000.01132000.01132000.01132000.01132000.0946000.0796000.0796000.0902000.0
Percentage of RestrictedCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalents us-gaap:FinancialInstrument, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:LetterOfCredit, xlrn:CertificatesofDepositsandMoneyMarketFunds


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1600000.01600000.01600000.01600000.01600000.01600000.01600000.01600000.01600000.01600000.01600000.01600000.01100000.01100000.0
Percentage of RestrictedCashAndCashEquivalents100.2100.20.0100.2100.2100.20.0100.2100.2100.2100.2100.297.297.2

us-gaap:RestrictedCashEquivalentsNoncurrent

us-gaap:RestrictedCashEquivalentsNoncurrent


Restricted
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1597000.01597000.01597000.01132000.0946000.0
Percentage of RestrictedCashEquivalentsNoncurrent100.0100.0100.0100.0100.0

us-gaap:RestrictedCashEquivalentsNoncurrent us-gaap:FinancialInstrument, us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:LetterOfCredit, us-gaap:CertificatesOfDeposit


Restricted
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1600000.01600000.01600000.01100000.0900000.0
Percentage of RestrictedCashEquivalentsNoncurrent100.2100.2100.297.295.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value0.5070.5510.4940.4970.4570.4820.3970.3660.3670.3940.3720.00.3980.2980.2670.5510.810.8070.7320.670.6080.6110.52152427300.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.1560.1560.0750.0750.0750.0750.00.00.0940.2360.2360.2680.2690.3330.3370.551
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber30.828.315.215.116.415.60.00.025.659.963.40.067.6111.7126.275.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value85.6579.8159.1654.6847.845.3639.239.1438.2238.5136.5336.4835.1435.4732.4431.3431.231.2831.5531.2231.0431.0531.5731.6741.241.20
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

xlrn:PerformanceBasedRestrictedStockUnits


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value86.0186.0152.9952.9952.9952.990031.4231.4231.4231.8531.8631.6331.5331.57
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.4107.889.696.9110.9116.80.00.082.281.686.087.390.789.297.2100.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value1863000.01781000.01732000.01843000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value42.5740.2639.137.22
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value236284264238
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-30
Value154169153138
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0100.0100.0100.0

us-gaap:TaxCreditCarryforwardAmount us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward

us-gaap:TaxCreditCarryforwardAmount

us-gaap:InternalRevenueServiceIRS, us-gaap:Research


Tax
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1914108.16.75.54.83.93.8
Percentage of TaxCreditCarryforwardAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction, us-gaap:Research


Tax
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value108.77.15.64.53.52.92.42.4
Percentage of TaxCreditCarryforwardAmount53.860.066.469.167.263.660.461.563.2

xlrn:AccruedCommercialExpenseCurrent

xlrn:AccruedCommercialExpenseCurrent


Accrued
Period End2020-12-312019-12-312018-12-31
Value1361000.01027000.00
Percentage of AccruedCommercialExpenseCurrent100.0100.00.0

xlrn:AccruedPurchases

xlrn:AccruedPurchases


Accrued
Period End2020-12-312019-12-312018-12-312017-12-31
Value256000.0119000.0351000.0150000.0
Percentage of AccruedPurchases100.0100.0100.0100.0

xlrn:AccruedResearchAndDevelopmentExpenseCurrent

xlrn:AccruedResearchAndDevelopmentExpenseCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value22118.1444.0145.2384.9382.2911.331.282
Percentage of AccruedResearchAndDevelopmentExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:CashCashEquivalentsAndAvailableForSaleSecurities

xlrn:CashCashEquivalentsAndAvailableForSaleSecurities


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value712795857887389415453468500513291319332353372366194213234251262278135148156165176
Percentage of CashCashEquivalentsAndAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value26000.010000.09000.067000.0199000.0209000.0325000.0465000.0511000.093000.0000001000.01000.02000.01000.061000.0279000.089000.0014000.09000.022000.00
Percentage of CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

xlrn:CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value161000.0153000.022000.019000.010000.0181000.028000.045000.050000.0213000.0466000.0725000.01042000.01324000.0895000.0256000.0354000.0402000.0426000.0129000.027000.064000.0220000.035000.071000.064000.00
Percentage of CashCashEquivalentsAndAvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

xlrn:CashCashEquivalentsAndAvailableforsaleSecuritiesAmortizedCostBasis

xlrn:CashCashEquivalentsAndAvailableforsaleSecuritiesAmortizedCostBasis


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value712795857887389415453467500513291320333354373366194213234251262278136148156165176
Percentage of CashCashEquivalentsAndAvailableforsaleSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:CashandCashEquivalentsAccumulatedGrossUnrealizedLossbeforeTax

xlrn:CashandCashEquivalentsAccumulatedGrossUnrealizedLossbeforeTax


Cashand
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-31
Value1000.01000.01000.0003000.07000.07000.012000.015000.04000.00
Percentage of CashandCashEquivalentsAccumulatedGrossUnrealizedLossbeforeTax100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.0

xlrn:CashandCashEquivalentsAmortizedCostBasis

xlrn:CashandCashEquivalentsAmortizedCostBasis


Cashand
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3364556707292832772371691632141441127969100
Percentage of CashandCashEquivalentsAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xlrn:CollaborativeArrangementFutureMilestonePaymentsReceivable us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory

xlrn:CollaborativeArrangementFutureMilestonePaymentsReceivable

xlrn:BristolMyersSquibbCompanyBMSformerlyCelgene, xlrn:DiscoveryStageCompounds, srt:Maximum, xlrn:AmendedSotaterceptAgreement, us-gaap:CollaborativeArrangement, xlrn:ClinicalMilestones


Collaborative
Period End2020-12-31
Value20
Percentage of CollaborativeArrangementFutureMilestonePaymentsReceivable100.0

xlrn:CollaborativeArrangementMilestonePaymentsPotential us-gaap:CounterpartyName, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory

xlrn:CollaborativeArrangementMilestonePaymentsPotential

xlrn:BristolMyersSquibbCompanyBMSformerlyCelgene, srt:Maximum, xlrn:REBLOZYLAgreement, us-gaap:CollaborativeArrangement, xlrn:DevelopmentRegulatoryandCommercialMilestones


Collaborative
Period End2020-12-312019-12-31
Value100125
Percentage of CollaborativeArrangementMilestonePaymentsPotential100.0100.0

xlrn:CollaborativeArrangementOptionFeesPotential us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:Range, us-gaap:TransactionType, us-gaap:TypeOfArrangement

xlrn:CollaborativeArrangementOptionFeesPotential

xlrn:BristolMyersSquibbCompanyBMSformerlyCelgene, xlrn:DiscoveryStageCompounds, srt:Maximum, xlrn:AmendedSotaterceptAgreement, us-gaap:CollaborativeArrangement


Collaborative
Period End2020-12-31
Value30
Percentage of CollaborativeArrangementOptionFeesPotential100.0

xlrn:CollaborativeArrangementPotentialMilestonePaymentsOnAcceptanceOfRegulatoryApplication us-gaap:ProductOrService, us-gaap:TypeOfArrangement, xlrn:MilestonePaymentsCategory

xlrn:CollaborativeArrangementPotentialMilestonePaymentsOnAcceptanceOfRegulatoryApplication

xlrn:Luspatercept, us-gaap:CollaborativeArrangement, xlrn:RegulatoryMilestone


Collaborative
Period End2020-12-31
Value20
Percentage of CollaborativeArrangementPotentialMilestonePaymentsOnAcceptanceOfRegulatoryApplication100.0

xlrn:DeferredTaxAssetsLeaseLiability

xlrn:DeferredTaxAssetsLeaseLiability


Deferred
Period End2020-12-312019-12-31
Value6528000.07090000.0
Percentage of DeferredTaxAssetsLeaseLiability100.0100.0

xlrn:OperatingLeaseLeasedArea

xlrn:OperatingLeaseLeasedArea


Operating
Period End2020-12-31
Value125000.0
Percentage of OperatingLeaseLeasedArea100.0

xlrn:PrepaidExpensesAndOtherCurrentAssetsPrepaidClinicalTrialExpenses

xlrn:PrepaidExpensesAndOtherCurrentAssetsPrepaidClinicalTrialExpenses


Prepaid
Period End2021-06-302020-12-31
Value587.93
Percentage of PrepaidExpensesAndOtherCurrentAssetsPrepaidClinicalTrialExpenses100.0100.0

Line plots across dimensions of each concept


us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amountus-gaap: Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)
Allocated Share Based Compensation Expenseus-gaap: Income Statement Location
us-gaap:ResearchAndDevelopmentExpense
us-gaap:CounterpartyName
(None,)
Research And Development Expenseus-gaap: Counterparty Name
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components