KRTX

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

Plots across concepts

Balance Sheet

Assets

Current Assets

NonCurrent Assets

PropertyPlantAndEquipmentNet

Liabilities

Current Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

NetCashProvidedByUsedInInvestingActivities

OperatingLeaseLiability

LesseeOperatingLeaseLiabilityPaymentsDue

Tables

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted	█▁	29.482511	27.786538	NA	26.186493	26.042434	NA	22.907349	0.103684	NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:EmployeeStockOption		NA	5.171914	NA	NA	4.974356	NA	NA	NA	NA
us-gaap:EarningsPerShareBasicAndDiluted	▁█	-1.17	-1.1	NA	-0.65	-0.33	0.9899999999999998	-0.39	-146.02	214500.0

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:AllocatedShareBasedCompensationExpense	█▁	7.466	5.822	NA	3.226	1.634	0.981	1.642	6.841	0.441
us-gaap:ComprehensiveIncomeNetOfTax	▁█	-34.43	-30.527	NA	-17.72	-7.092	-7.819	-9.059	-15.069	-8.327
us-gaap:GeneralAndAdministrativeExpense	█▁	10.384	9.777	NA	7.006	5.635	3.874	4.103	8.286	1.426
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	▁█	-34.416	-30.497	NA	-17.046	-8.658	-7.774	-9.038	-15.14	-8.327
us-gaap:NetIncomeLoss	▁█	-34.416	-30.497	NA	-17.046	-8.658	-7.774	-9.038	-15.14	-8.327
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings	▁█	-34.416	-30.497	NA	-17.046	-8.658	NA	-9.038	-15.14	NA
us-gaap:NonoperatingIncomeExpense	█▁	0.115	-0.534	NA	0.779	1.397	1.092	0.858	-0.07	-0.181
us-gaap:OperatingExpenses	█▁	34.531	29.963	NA	17.825	10.055	8.866	9.896	15.07	8.146
us-gaap:OperatingIncomeLoss	▁█	-34.531	-29.963	NA	-17.825	-10.055	-8.866	-9.896	-15.07	-8.146
us-gaap:ProfitLoss	▁█	-34.416	-30.497	NA	-17.046	-8.658	-7.774	-9.038	-15.14	-8.327
us-gaap:ResearchAndDevelopmentExpense	█▁	24.147	20.186	NA	10.819	4.42	4.992	5.793	6.784	6.72

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:Assets	██▅▅▆▆▃▂▁	577.188	593.264	347.625	377.816	389.718	393.024	164.227	79.357	15.857
us-gaap:Liabilities	█▄▄▃▂▂▁▁▂	16.85	8.35	8.694	6.013	4.777	3.108	1.697	2.454	3.814
us-gaap:LiabilitiesAndStockholdersEquity	██▅▅▆▆▃▂▁	577.188	593.264	347.625	377.816	389.718	393.024	164.227	79.357	15.857
us-gaap:StockholdersEquity	██▅▆▆▆▃▁▁	560.338	584.914	338.931	371.803	384.941	389.916	162.53	-46.989	-29.922

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:AssetsCurrent	██▅▅▆▆▃▂▁	567.098	590.018	344.599	374.856	386.668	392.706	163.928	79.048	15.596
us-gaap:CashAndCashEquivalentsAtCarryingValue	██▂▄▅▅▂▁▁	345.649	353.685	53.048	133.873	190.645	208.929	54.144	10.495	8.904
us-gaap:OtherAssetsCurrent	▅▃█▁▂▃	0.783	0.535	1.088	0.255	0.317	0.485	NA	0.063	0.023
us-gaap:PrepaidExpenseAndOtherAssetsCurrent	█▆█▃▁▂▁▁▁	23.065	18.318	21.864	6.933	3.177	3.309	2.323	1.717	1.709

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:PropertyPlantAndEquipmentGross		NA	NA	0.651	NA	NA	0.252	NA	NA	0.145
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ComputerEquipment		NA	NA	0.229	NA	NA	0.087	NA	NA	0.008
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:FurnitureAndFixtures		NA	NA	0.085	NA	NA	0.01	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovements		NA	NA	0.154	NA	NA	0.115	NA	NA	0.106
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:OfficeEquipment		NA	NA	0.029	NA	NA	0.002	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:SoftwareDevelopment		NA	NA	0.154	NA	NA	0.038	NA	NA	NA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		NA	NA	0.202	NA	NA	0.057	NA	NA	0.007
us-gaap:PropertyPlantAndEquipmentNet	█▂▂▂▂▁▁▁▁	1.773	0.403	0.449	0.433	0.371	0.195	0.176	0.186	0.138
us-gaap:OperatingLeaseRightOfUseAsset	█▁▂▂▂	7.327	1.576	2.42	2.37	2.522	NA	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▁█	0.729	1.006	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:AccountsPayableCurrent	█▅▄▃▃▃▁▄▁	1.966	1.298	0.865	0.773	0.603	0.547	0.158	0.96	0.269
us-gaap:AccruedLiabilitiesCurrent	█▆▇▄▂▃▂▂▁	6.345	4.433	5.144	2.622	1.425	2.353	1.319	1.26	0.538
us-gaap:LiabilitiesCurrent	█▅▅▃▂▂▁▂▁	10.309	6.628	6.853	4.069	2.652	2.958	1.533	2.275	1.196
us-gaap:OperatingLeaseLiabilityCurrent	█▁▁	1.963	0.862	0.844	NA	NA	NA	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent	█▃▂▂▂▁▁▁▁	0.948	0.256	0.203	0.158	0.188	0.044	0.053	0.045	0.052

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:OperatingLeaseLiabilityNoncurrent	█▁▁	6.437	1.618	1.841	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	█▁▁	2.52	0.949	1.001	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree	▄	1.597	NA	0.949	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour	▄	1.622	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:StockholdersEquity	██▅▆▆▆▃▁▁	560.338	584.914	338.931	371.803	384.941	389.916	162.53	-46.989	-29.922
us-gaap:AdditionalPaidInCapitalCommonStock	██▅▅▅▅▃▁▁	769.319	759.465	482.955	472.119	467.537	465.42	230.216	11.64	1.633
us-gaap:RetainedEarningsAccumulatedDeficit	▁▂▄▅▆▆▇▇█	-208.979	-174.563	-144.066	-101.216	-84.17	-75.512	-67.738	-58.7	-31.555
us-gaap:StockIssuedDuringPeriodValueNewIssues		NA	270.017	NA	NA	NA	NA	93.044	NA	NA
us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital		NA	270.017	NA	NA	NA	NA	93.043	NA	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▁	7.466	5.822	NA	3.226	1.634	NA	1.642	6.841	NA

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▁█	-28.893	-21.179	NA	-15.789	-8.341	-6.82	-8.416	-9.573	-6.864
us-gaap:NetCashProvidedByUsedInInvestingActivities	▁█	18.604	51.097	NA	-42.055	-10.426	NA	NA	-64.521	NA
us-gaap:NetCashProvidedByUsedInFinancingActivities	▁█	2.253	270.823	NA	1.072	0.517	234.224	94.243	0.314	2.7
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	▁█	-8.036	300.741	NA	-56.772	-18.25	154.785	43.649	-73.78	-9.279

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:DepreciationDepletionAndAmortization	▁█	0.052	0.112	NA	0.033	0.021	0.021	0.015	0.012	0.004
us-gaap:IncreaseDecreaseInAccountsPayable	█▁	0.779	0.322	NA	0.142	0.024	0.389	-0.364	-0.332	0.073
us-gaap:NetCashProvidedByUsedInOperatingActivities	▁█	-28.893	-21.179	NA	-15.789	-8.341	-6.82	-8.416	-9.573	-6.864
us-gaap:NetIncomeLoss	▁█	-34.416	-30.497	NA	-17.046	-8.658	-7.774	-9.038	-15.14	-8.327
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings	▁█	-34.416	-30.497	NA	-17.046	-8.658	NA	-9.038	-15.14	NA
us-gaap:ProfitLoss	▁█	-34.416	-30.497	NA	-17.046	-8.658	-7.774	-9.038	-15.14	-8.327
us-gaap:ShareBasedCompensation	█▁	7.466	5.822	NA	3.226	1.634	0.981	1.642	6.841	0.441

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:NetCashProvidedByUsedInInvestingActivities	▁█	18.604	51.097	NA	-42.055	-10.426	NA	NA	-64.521	NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment	█▁	0.739	0.047	NA	0.157	0.076	NA	NA	0.053	NA
us-gaap:PaymentsToAcquireInvestments	█▁	109.594	80.856	NA	61.898	70.35	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:NetCashProvidedByUsedInFinancingActivities	▁█	2.253	270.823	NA	1.072	0.517	234.224	94.243	0.314	2.7

		2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType us-gaap:ConvertibleDebt		NA	NA	1e-05	NA	NA	NA	NA	NA	NA

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30
Value	29	27	26	26	22	0.103684	0.002677	5e-06
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption

Period End	2021-03-31	2020-03-31	2019-03-31
Value	5.171914	4.974356	3.755633
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100.0	100.0	100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-1.17	-1.1	-0.65	-0.33	0.99	-0.39	-146.02	-4484.0	214500.0	-1247600.0
Percentage of EarningsPerShareBasicAndDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	7.466	5.822	3.226	1.634	0.981	1.642	6.841	3.104	0.441	0.406	0.066
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	4.651	3.741	2.308	0.349	0.771	1.496	6.697	3.024	0.405	0.378	0.048
Percentage of AllocatedShareBasedCompensationExpense	62.3	64.3	71.5	21.4	78.6	91.1	97.9	97.4	91.8	93.1	72.7
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Revenues us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ResearchAndDevelopmentExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	2.815	2.081	0.918	1.285	0.209	0.147	0.144	0.08	0.036	0.028	0.018
Percentage of AllocatedShareBasedCompensationExpense	37.7	35.7	28.5	78.6	21.3	9.0	2.1	2.6	8.2	6.9	27.3
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Revenues us-gaap:ResearchAndDevelopmentExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	-34430000.0	-30527000.0	-17720000.0	-7092000.0	-7819000.0	-9059000.0	-15069000.0	-12005000.0	-8327000.0	-6238000.0	-539000.0
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	10	9.777	7.006	5.635	3.874	4.103	8.286	4.606	1.426	1.056	0.256
Percentage of GeneralAndAdministrativeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-7774000.0	-9038000.0	-15140000.0	-12005000.0	-8327000.0	-6238000.0	-539000.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-7774000.0	-9038000.0	-15140000.0	-12005000.0	-8327000.0	-6238000.0	-539000.0	-2408000.0
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-9038000.0	-15140000.0	-12005000.0	-6238000.0	-539000.0	-2408000.0
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Revenues us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	115000.0	-534000.0	779000.0	1397000.0	1092000.0	858000.0	-70000.0	-432000.0	-181000.0	-3765000.0	1892000.0
Percentage of NonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Operating Expenses

us-gaap:OperatingExpenses

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	34	29	17	10	8.866	9.896	15	11	8.146	2.473	2.431
Percentage of OperatingExpenses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	-34531000.0	-29963000.0	-17825000.0	-10055000.0	-8866000.0	-9896000.0	-15070000.0	-11573000.0	-8146000.0	-2473000.0	-2431000.0
Percentage of OperatingIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-7774000.0	-9038000.0	-15140000.0	-12005000.0	-8327000.0	-6238000.0
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	24	20	10	4.42	4.992	5.793	6.784	6.967	6.72	1.417	2.175
Percentage of ResearchAndDevelopmentExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Assets

us-gaap:Assets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	577	593	347	377	389	393	164	79	15
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	16	8.35	8.694	6.013	4.777	3.108	1.697	2.454	3.814
Percentage of Liabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.9	1.4	2.5	1.6	1.2	0.8	1.0	3.1	24.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	577	593	347	377	389	393	164	79	15
Percentage of LiabilitiesAndStockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	560	584	338	371	384	389	162	-46.989	-38.765	-29.922	-22.01	-16.187	-15.722	-13.368
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	97.1	98.6	97.5	98.4	98.8	99.2	99.0	-59.2	0.0	-188.7	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-0.005	0.009	0.039	0.897	1.571	0.005	0.05	0.071
Percentage of StockholdersEquity	-0.0	0.0	0.0	0.2	0.4	0.0	0.0	-0.2
Percentage of Assets	-0.0	0.0	0.0	0.2	0.4	0.0	0.0	0.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	769	759	482	472	467	465	230	11	4.795	1.633	1.218	0.803	0.729	0.675
Percentage of StockholdersEquity	137.3	129.8	142.5	127.0	121.5	119.4	141.6	-24.8	-12.4	-5.5	-5.5	-5.0	-4.6	-5.0
Percentage of Assets	133.3	128.0	138.9	125.0	120.0	118.4	140.2	14.7	0.0	10.3	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0.003	0.003	0.003	0.003	0.003	0.003	0.002
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	-208.979	-174.563	-144.066	-101.216	-84.17	-75.512	-67.738	-58.7	-43.56	-31.555	-23.228	-16.99	-16.451	-14.043
Percentage of StockholdersEquity	-37.3	-29.8	-42.5	-27.2	-21.9	-19.4	-41.7	124.9	112.4	105.5	105.5	105.0	104.6	105.0
Percentage of Assets	-36.2	-29.4	-41.4	-26.8	-21.6	-19.2	-41.2	-74.0	0.0	-199.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Assets Current

us-gaap:AssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	567	590	344	374	386	392	163	79	15
Percentage of AssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	98.3	99.5	99.1	99.2	99.2	99.9	99.8	99.6	98.4

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	345	353	53	133	190	208	54	10	8.904
Percentage of CashAndCashEquivalentsAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	59.9	59.6	15.3	35.4	48.9	53.2	33.0	13.2	56.2

Other Assets Current

us-gaap:OtherAssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-06-30	2018-12-31
Value	783000.0	535000.0	1088000.0	255000.0	317000.0	485000.0	63000.0	23000.0
Percentage of OtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.3	0.1	0.1	0.1	0.1	0.1

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	23	18	21	6.933	3.177	3.309	2.323	1.717	1.709
Percentage of PrepaidExpenseAndOtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	4.0	3.1	6.3	1.8	0.8	0.8	1.4	2.2	10.8

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

Period End	2020-12-31	2019-12-31	2018-12-31
Value	651000.0	252000.0	145000.0
Percentage of PropertyPlantAndEquipmentGross	100.0	100.0	100.0
Percentage of Assets	0.2	0.1	0.9

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ComputerEquipment

Period End	2020-12-31	2019-12-31	2018-12-31
Value	229000.0	87000.0	8000.0
Percentage of PropertyPlantAndEquipmentGross	35.2	34.5	5.5
Percentage of Assets	0.1	0.0	0.1
Percentage of Assets us-gaap:ComputerEquipment	0.0	0.0	0.0

us-gaap:FurnitureAndFixtures

Period End	2020-12-31	2019-12-31
Value	85000.0	10000.0
Percentage of PropertyPlantAndEquipmentGross	13.1	4.0
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:FurnitureAndFixtures	0.0	0.0

us-gaap:LeaseholdImprovements

Period End	2020-12-31	2019-12-31	2018-12-31
Value	154000.0	115000.0	106000.0
Percentage of PropertyPlantAndEquipmentGross	23.7	45.6	73.1
Percentage of Assets	0.0	0.0	0.7
Percentage of Assets us-gaap:LeaseholdImprovements	0.0	0.0	0.0

us-gaap:OfficeEquipment

Period End	2020-12-31	2019-12-31
Value	29000.0	2000.0
Percentage of PropertyPlantAndEquipmentGross	4.5	0.8
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:OfficeEquipment	0.0	0.0

us-gaap:SoftwareDevelopment

Period End	2020-12-31	2019-12-31
Value	154000.0	38000.0
Percentage of PropertyPlantAndEquipmentGross	23.7	15.1
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:SoftwareDevelopment	0.0	0.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	2020-12-31	2019-12-31	2018-12-31
Value	202000.0	57000.0	7000.0
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	100.0	100.0	100.0
Percentage of Assets	0.1	0.0	0.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	1773000.0	403000.0	449000.0	433000.0	371000.0	195000.0	176000.0	186000.0	138000.0
Percentage of PropertyPlantAndEquipmentNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.1	0.1	0.1	0.1	0.0	0.1	0.2	0.9

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31
Value	7327000.0	1576000.0	2420000.0	2370000.0	2522000.0
Percentage of OperatingLeaseRightOfUseAsset	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.3	0.3	0.7	0.6	0.6

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

krtx:OfficeSpace, us-gaap:SubsequentEvent

Period End	2021-04-01
Value	6200000.0
Percentage of OperatingLeaseRightOfUseAsset	0.0
Percentage of Assets	0.0
Percentage of Assets krtx:OfficeSpace us-gaap:SubsequentEvent	0.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-04-01
Value	6200000.0
Percentage of OperatingLeaseRightOfUseAsset	0.0
Percentage of Assets	0.0
Percentage of Assets krtx:BostonMassachusetts krtx:OfficeSpace	0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	2021-06-30	2021-03-31
Value	729000.0	1006000.0
Percentage of OtherAssetsNoncurrent	100.0	100.0
Percentage of Assets	0.1	0.2

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	1966000.0	1298000.0	865000.0	773000.0	603000.0	547000.0	158000.0	960000.0	269000.0
Percentage of AccountsPayableCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.2	0.2	0.2	0.2	0.1	0.1	1.2	1.7

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	6345000.0	4433000.0	5144000.0	2622000.0	1425000.0	2353000.0	1319000.0	1260000.0	538000.0
Percentage of AccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.1	0.7	1.5	0.7	0.4	0.6	0.8	1.6	3.4

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	10	6.628	6.853	4.069	2.652	2.958	1.533	2.275	1.196
Percentage of LiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.8	1.1	2.0	1.1	0.7	0.8	0.9	2.9	7.5

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

Period End	2021-06-30	2021-03-31	2020-12-31
Value	1963000.0	862000.0	844000.0
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0	100.0
Percentage of Assets	0.3	0.1	0.2

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	948000.0	256000.0	203000.0	158000.0	188000.0	44000.0	53000.0	45000.0	52000.0
Percentage of OtherAccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.2	0.0	0.1	0.0	0.0	0.0	0.0	0.1	0.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31
Value	6437000.0	1618000.0	1841000.0
Percentage of OperatingLeaseLiabilityNoncurrent	100.0	100.0	100.0
Percentage of Assets	1.1	0.3	0.5

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2021-06-30	2021-03-31	2020-12-31
Value	2520000.0	949000.0	1001000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0	100.0	100.0
Percentage of Assets	0.4	0.2	0.3

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2021-06-30	2020-12-31
Value	1597000.0	949000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0	100.0
Percentage of Assets	0.3	0.3

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2021-06-30
Value	1622000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0
Percentage of Assets	0.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31
Value	8400000.0	2480000.0	2686000.0	2618000.0	2749000.0
Percentage of OperatingLeaseLiability	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.5	0.4	0.8	0.7	0.7

us-gaap:OperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

krtx:OfficeSpace, us-gaap:SubsequentEvent

Period End	2021-04-01
Value	6000000.0
Percentage of OperatingLeaseLiability	0.0
Percentage of Assets	0.0
Percentage of Assets krtx:OfficeSpace us-gaap:SubsequentEvent	0.0

us-gaap:OperatingLeaseLiability us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-04-01
Value	6000000.0
Percentage of OperatingLeaseLiability	0.0
Percentage of Assets	0.0
Percentage of Assets krtx:BostonMassachusetts krtx:OfficeSpace	0.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2021-06-30	2021-03-31	2020-12-31
Value	9414000.0	2688000.0	2932000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0	100.0	100.0
Percentage of Assets	1.6	0.5	0.8

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2021-06-30	2021-03-31	2020-12-31
Value	1014000.0	208000.0	246000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0	100.0	100.0
Percentage of Assets	0.2	0.0	0.1

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	560	584	338	371	384	389	162	-46.989	-38.765	-29.922	-22.01	-16.187	-15.722	-13.368
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	97.1	98.6	97.5	98.4	98.8	99.2	99.0	-59.2	0.0	-188.7	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-0.005	0.009	0.039	0.897	1.571	0.005	0.05	0.071
Percentage of StockholdersEquity	-0.0	0.0	0.0	0.2	0.4	0.0	0.0	-0.2
Percentage of Assets	-0.0	0.0	0.0	0.2	0.4	0.0	0.0	0.1
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	769	759	482	472	467	465	230	11	4.795	1.633	1.218	0.803	0.729	0.675
Percentage of StockholdersEquity	137.3	129.8	142.5	127.0	121.5	119.4	141.6	-24.8	-12.4	-5.5	-5.5	-5.0	-4.6	-5.0
Percentage of Assets	133.3	128.0	138.9	125.0	120.0	118.4	140.2	14.7	0.0	10.3	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0.003	0.003	0.003	0.003	0.003	0.003	0.002
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	-208.979	-174.563	-144.066	-101.216	-84.17	-75.512	-67.738	-58.7	-43.56	-31.555	-23.228	-16.99	-16.451	-14.043
Percentage of StockholdersEquity	-37.3	-29.8	-42.5	-27.2	-21.9	-19.4	-41.7	124.9	112.4	105.5	105.5	105.0	104.6	105.0
Percentage of Assets	-36.2	-29.4	-41.4	-26.8	-21.6	-19.2	-41.2	-74.0	0.0	-199.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	769	759	482	472	467	465	230	11	1.633
Percentage of AdditionalPaidInCapitalCommonStock	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	133.3	128.0	138.9	125.0	120.0	118.4	140.2	14.7	10.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	-208980000.0	-174560000.0	-144070000.0	-101220000.0	-84170000.0	-75512000.0	-67738000.0	-58700000.0	-31555000.0
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	-36.2	-29.4	-41.4	-26.8	-21.6	-19.2	-41.2	-74.0	-199.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

Period End	2021-03-31	2019-09-30
Value	270	93
Percentage of StockIssuedDuringPeriodValueNewIssues	100.0	100.0
Percentage of Assets	0.0	0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-03-31	2019-09-30
Value	270	93
Percentage of StockIssuedDuringPeriodValueNewIssues	100.0	100.0
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	7.466	5.822	3.226	1.634	1.642	6.841	3.104	0.415	0.074	0.054
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	7.466	5.822	3.226	1.634	1.642	6.841	3.104	0.415	0.074	0.054
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-28893000.0	-21179000.0	-15789000.0	-8341000.0	-6820000.0	-8416000.0	-9573000.0	-6114000.0	-6864000.0	-2131000.0
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	18	51	-42.055	-10.426	-64.521	4.983
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	2.253	270	1.072	0.517	234	94	0.314	76	2.7	17
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-8.036	300	-56.772	-18.25	154	43	-73.78	75	-9.279	15
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	52000.0	112000.0	33000.0	21000.0	21000.0	15000.0	12000.0	10000.0	4000.0	0
Percentage of DepreciationDepletionAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	779000.0	322000.0	142000.0	24000.0	389000.0	-364000.0	-332000.0	585000.0	73000.0	176000.0
Percentage of IncreaseDecreaseInAccountsPayable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-28893000.0	-21179000.0	-15789000.0	-8341000.0	-6820000.0	-8416000.0	-9573000.0	-6114000.0	-6864000.0	-2131000.0
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-7774000.0	-9038000.0	-15140000.0	-12005000.0	-8327000.0	-6238000.0	-539000.0	-2408000.0
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-9038000.0	-15140000.0	-12005000.0	-6238000.0	-539000.0	-2408000.0
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Revenues us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-34416000.0	-30497000.0	-17046000.0	-8658000.0	-7774000.0	-9038000.0	-15140000.0	-12005000.0	-8327000.0	-6238000.0
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	7.466	5.822	3.226	1.634	0.981	1.642	6.841	3.104	0.441	0.407
Percentage of ShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	18	51	-42.055	-10.426	-64.521	4.983
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	739000.0	47000.0	157000.0	76000.0	53000.0	17000.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	109	80	61	70
Percentage of PaymentsToAcquireInvestments	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	2.253	270	1.072	0.517	234	94	0.314	76	2.7	17
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:ConvertibleDebt

Period End	2020-12-31
Value	10.0
Percentage of DebtInstrumentInterestRateStatedPercentage	100.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations us-gaap:ConvertibleDebt	0.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	42.91	41.21	28.63	23.18	17.79	8.94	8.58	8.63	4.49
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

Period End	2020-12-31	2019-12-31	2018-12-31
Value	59	21	7.122
Percentage of DeferredTaxAssetsValuationAllowance	100.0	100.0	100.0

krtx:AdjustmentsToAdditionalPaidInCapitalStockUnderwritingDiscountsAndCommissions us-gaap:SubsidiarySaleOfStock

krtx:AdjustmentsToAdditionalPaidInCapitalStockUnderwritingDiscountsAndCommissions

us-gaap:IPO

Period End	2021-03-31
Value	17
Percentage of AdjustmentsToAdditionalPaidInCapitalStockUnderwritingDiscountsAndCommissions	100.0

krtx:IncreaseDecreaseInAccruedInterestOnInvestmentSecurities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	-72000.0	-277000.0	-254000.0	441000.0
Percentage of IncreaseDecreaseInAccruedInterestOnInvestmentSecurities	100.0	100.0	100.0	100.0

krtx:IncreaseDecreaseInOperatingLeaseLiability

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	-120000.0	-205000.0	-131000.0	-102000.0
Percentage of IncreaseDecreaseInOperatingLeaseLiability	100.0	100.0	100.0	100.0

krtx:IncreaseDecreaseInRightOfUseAssets

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	-416000.0	-167000.0	-152000.0	-121000.0
Percentage of IncreaseDecreaseInRightOfUseAssets	100.0	100.0	100.0	100.0

krtx:InitialFixedRentalAmountPerRentableSquareFootOfPremisesPerAnnum us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:InitialFixedRentalAmountPerRentableSquareFootOfPremisesPerAnnum

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-03-31
Value	60.0
Percentage of InitialFixedRentalAmountPerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum us-gaap:PropertyPlantAndEquipmentByType

krtx:InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum

krtx:Premises

Period End	2021-04-30
Value	2.0
Percentage of InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

krtx:Premises, us-gaap:SubsequentEvent

Period End	2021-04-30
Value	2.0
Percentage of InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:Boston, krtx:OfficeSpace

Period End	2021-03-31
Value	2.0
Percentage of InitialFixedRentalIncomeIncreaseRatePerRentableSquareFootOfPremisesPerAnnum	0.0

krtx:InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum us-gaap:PropertyPlantAndEquipmentByType

krtx:InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum

krtx:Premises

Period End	2021-04-30
Value	61.0
Percentage of InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

krtx:Premises, us-gaap:SubsequentEvent

Period End	2021-04-30
Value	61.0
Percentage of InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:Boston, krtx:OfficeSpace

Period End	2021-03-31
Value	59.0
Percentage of InitialFixedRentalIncomePerRentableSquareFootOfPremisesPerAnnum	0.0

krtx:InitialFixedRentalIncreaseAmountPerRentableSquareFootOfPremisesPerAnnum us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:InitialFixedRentalIncreaseAmountPerRentableSquareFootOfPremisesPerAnnum

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-03-31
Value	1.0
Percentage of InitialFixedRentalIncreaseAmountPerRentableSquareFootOfPremisesPerAnnum	100.0

krtx:MonthlyInstallmentOfBaseRent us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:MonthlyInstallmentOfBaseRent

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-06-30	2021-03-31
Value	0	100000.0
Percentage of MonthlyInstallmentOfBaseRent	0.0	100.0

krtx:MonthlyInstallmentOfBaseRentalIncome us-gaap:Range, us-gaap:StatementGeographical, us-gaap:BalanceSheetLocation, us-gaap:PropertyPlantAndEquipmentByType

krtx:MonthlyInstallmentOfBaseRentalIncome

srt:Maximum, krtx:Boston, krtx:DeferredRent, krtx:OfficeSpace

Period End	2021-03-31
Value	100000.0
Percentage of MonthlyInstallmentOfBaseRentalIncome	100.0

krtx:ProceedsFromIssuanceOfPublicOfferingNetInUnderwritingDiscountsAndCommissions

Period End	2021-06-30	2021-03-31
Value	0.0	270
Percentage of ProceedsFromIssuanceOfPublicOfferingNetInUnderwritingDiscountsAndCommissions	0.0	100.0

krtx:PurchasesOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpenses

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	683000.0	19000.0	-62000.0	121000.0
Percentage of PurchasesOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpenses	100.0	100.0	100.0	100.0

krtx:StockIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction

Period End	2021-03-31	2020-06-30	2020-03-31	2019-03-31
Value	135000.0	54000.0	34000.0	529000.0
Percentage of StockIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction	100.0	100.0	100.0	100.0

krtx:UnderwritingDiscountsAndCommissions us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

krtx:UnderwritingDiscountsAndCommissions

us-gaap:CommonStock, krtx:FollowOnPublicOffering

Period End	2021-03-04
Value	17
Percentage of UnderwritingDiscountsAndCommissions	100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	-202000.0	-221000.0	-104000.0	21000.0
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments	100.0	100.0	100.0	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts us-gaap:SubsidiarySaleOfStock

us-gaap:AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts

us-gaap:IPO

Period End	2021-03-31
Value	233000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	100.0

us-gaap:DefinedContributionPlanCostRecognized

Period End	2021-06-30	2021-03-31
Value	100000.0	200000.0
Percentage of DefinedContributionPlanCostRecognized	100.0	100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	1253000.0	-754000.0	1233000.0	-1051000.0	1034000.0	454000.0	253000.0	74000.0	121000.0	-142000.0
Percentage of IncreaseDecreaseInAccruedLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInDeferredCharges

Period End	2021-06-30	2021-03-31
Value	0	-35000.0
Percentage of IncreaseDecreaseInDeferredCharges	0.0	100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

Period End	2021-06-30	2021-03-31
Value	-277000.0	1006000.0
Percentage of IncreaseDecreaseInOtherNoncurrentAssets	100.0	100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities

Period End	2021-06-30	2021-03-31
Value	0	104000.0
Percentage of IncreaseDecreaseInOtherNoncurrentLiabilities	0.0	100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	4.874	-3.546	3.756	-0.132	0.986	0.606	1.486	-1.478	-0.542	0.107
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InvestmentIncomeNet

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	106000.0	143000.0	779000.0	1397000.0	1092000.0	858000.0	452000.0	115000.0
Percentage of InvestmentIncomeNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LeaseCost

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	532000.0	207000.0	193000.0	155000.0
Percentage of LeaseCost	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	541000.0	207000.0	193000.0	155000.0
Percentage of OperatingLeaseCost	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseImpairmentLoss

Period End	2021-06-30	2021-03-31
Value	0	677000.0
Percentage of OperatingLeaseImpairmentLoss	0.0	100.0

us-gaap:OperatingLeaseImpairmentLoss us-gaap:PropertyPlantAndEquipmentByType

krtx:OfficeSpace

Period End	2021-06-30	2021-03-31
Value	0	700000.0
Percentage of OperatingLeaseImpairmentLoss	0.0	103.4

us-gaap:OperatingLeasePayments

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	246000.0	244000.0	172000.0	136000.0
Percentage of OperatingLeasePayments	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30
Value	-14000.0	-30000.0	-674000.0	1566000.0	71000.0
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30
Value	-14000.0	-30000.0	-674000.0	1566000.0	71000.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30
Value	-14000.0	-30000.0	-674000.0	1566000.0	71000.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsOfStockIssuanceCosts

Period End	2021-06-30	2021-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	135000.0	98000.0	0	1210000.0	1102000.0	97000.0
Percentage of PaymentsOfStockIssuanceCosts	100.0	100.0	0.0	100.0	100.0	100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:CommonStock, krtx:FollowOnPublicOffering

Period End	2021-03-04
Value	270
Percentage of ProceedsFromIssuanceOfCommonStock	100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	119	132	20	60	0.0	5.0
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	100.0	100.0	100.0	100.0	0.0	100.0

us-gaap:ProceedsFromStockOptionsExercised

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	2388000.0	671000.0	1356000.0	517000.0
Percentage of ProceedsFromStockOptionsExercised	100.0	100.0	100.0	100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:AccountingStandardsUpdate201602

Period End	2021-03-31	2020-06-30	2020-03-31	2020-01-01
Value	1800000.0	0	1400000.0	1800000.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	100.0	0.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31
Value	7.38	11.8
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	100.0	100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31
Value	11.72	38.73
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	100.0	100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31
Value	-0.34	128.5
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30
Value	2388000.0	671000.0	1356000.0	517000.0	4000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-06-30
Value	2388000.0	671000.0	1356000.0	517000.0	4000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	100.0	100.0	100.0	100.0	100.0

us-gaap:SubleaseIncome

Period End	2021-06-30
Value	9000.0
Percentage of SubleaseIncome	100.0

krtx:AccruedResearchAndDevelopmentExpenseCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	2741000.0	2755000.0	1829000.0	1036000.0	398000.0	344000.0	198000.0	145000.0	100000.0
Percentage of AccruedResearchAndDevelopmentExpenseCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainsBeforeTax

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	34000.0	19000.0	56000.0	5000.0
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainsBeforeTax	100.0	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossesBeforeTax

Period End	2021-06-30	2021-03-31	2020-12-31
Value	39000.0	10000.0	17000.0
Percentage of AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossesBeforeTax	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesAmortizedCostBasis

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	197	217	269	180
Percentage of AvailableForSaleSecuritiesAmortizedCostBasis	100.0	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearAndLessThanTwoYears us-gaap:FinancialInstrument

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearAndLessThanTwoYears

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31
Value	25	4.131
Percentage of AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearAndLessThanTwoYears	100.0	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsFairValue us-gaap:FinancialInstrument

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsFairValue

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31
Value	25	4.131
Percentage of AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsFairValue	100.0	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsUnrealizedGains us-gaap:FinancialInstrument

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsUnrealizedGains

us-gaap:CorporateDebtSecurities

Period End	2021-06-30
Value	2000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearLessThanTwoYearsUnrealizedGains	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueYearAndLessThanTwoYearsUnrealizedLosses us-gaap:FinancialInstrument

krtx:AvailableForSaleSecuritiesDebtMaturitiesDueYearAndLessThanTwoYearsUnrealizedLosses

us-gaap:CorporateDebtSecurities

Period End	2021-06-30
Value	22000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesDueYearAndLessThanTwoYearsUnrealizedLosses	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGains us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGains

us-gaap:CommercialPaper

Period End	2021-06-30	2021-03-31	2020-12-31
Value	31000.0	13000.0	16000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGains	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGains us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31	2020-12-31
Value	1000.0	1000.0	3000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedGains	3.2	7.7	18.8

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLosses us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLosses

us-gaap:CommercialPaper

Period End	2021-06-30	2021-03-31	2020-12-31
Value	2000.0	1000.0	1000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLosses	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLosses us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31	2020-12-31
Value	12000.0	9000.0	9000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearUnrealizedLosses	600.0	900.0	900.0

krtx:AvailableForSaleSecuritiesFairValue

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	197	217	269	180
Percentage of AvailableForSaleSecuritiesFairValue	100.0	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsAmortizedCost us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsAmortizedCost

us-gaap:USTreasurySecurities

Period End	2021-06-30
Value	10
Percentage of AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsAmortizedCost	100.0

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsFairValue us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsFairValue

us-gaap:USTreasurySecurities

Period End	2021-06-30
Value	10
Percentage of AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsFairValue	100.0

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsUnrealizedLosses us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsUnrealizedLosses

us-gaap:USTreasurySecurities

Period End	2021-06-30
Value	3000.0
Percentage of AvailableForSaleSecuritiesMaturitiesAfterOneYearAndLessThanTwoYearsUnrealizedLosses	100.0

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearFairValue us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearFairValue

us-gaap:USTreasurySecurities

Period End	2021-06-30	2020-12-31	2020-09-30	2019-12-31
Value	20	172	99	180
Percentage of AvailableForSaleSecuritiesMaturitiesWithInOneYearFairValue	100.0	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedGains us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedGains

us-gaap:USTreasurySecurities

Period End	2020-12-31	2020-09-30	2019-12-31
Value	37000.0	5000.0	5000.0
Percentage of AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedGains	100.0	100.0	100.0

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedLosses us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedLosses

us-gaap:USTreasurySecurities

Period End	2020-12-31
Value	7000.0
Percentage of AvailableForSaleSecuritiesMaturitiesWithInOneYearUnrealizedLosses	100.0

krtx:AvailableForSaleSecuritiesMaturitiesWithinOneYearAmortizedCost us-gaap:CashAndCashEquivalents

krtx:AvailableForSaleSecuritiesMaturitiesWithinOneYearAmortizedCost

us-gaap:USTreasurySecurities

Period End	2021-06-30	2020-12-31	2020-09-30	2019-12-31
Value	20	172	99	180
Percentage of AvailableForSaleSecuritiesMaturitiesWithinOneYearAmortizedCost	100.0	100.0	100.0	100.0

krtx:CashCashEquivalentsAndAvailableForSaleInvestments

Period End	2021-06-30	2021-03-31	2020-12-31
Value	543	571	322
Percentage of CashCashEquivalentsAndAvailableForSaleInvestments	100.0	100.0	100.0

krtx:DebtInstrumentInterestRatePercentageInEventOfDefault us-gaap:LongtermDebtType

krtx:DebtInstrumentInterestRatePercentageInEventOfDefault

us-gaap:ConvertibleDebt

Period End	2020-12-31
Value	15.0
Percentage of DebtInstrumentInterestRatePercentageInEventOfDefault	100.0

krtx:DeferredTaxAssetsAccruedExpenses

Period End	2020-12-31	2019-12-31	2018-12-31
Value	631000.0	580000.0	134000.0
Percentage of DeferredTaxAssetsAccruedExpenses	100.0	100.0	100.0

krtx:DeferredTaxAssetsLeaseLiability

Period End	2020-12-31
Value	702000.0
Percentage of DeferredTaxAssetsLeaseLiability	100.0

krtx:DeferredTaxLiabilitiesRightOfUseAssets

Period End	2020-12-31
Value	633000.0
Percentage of DeferredTaxLiabilitiesRightOfUseAssets	100.0

krtx:PrepaidResearchAndDevelopmentExpenses

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2019-12-31
Value	22	16	18	6.655	0.694
Percentage of PrepaidResearchAndDevelopmentExpenses	100.0	100.0	100.0	100.0	100.0

krtx:SubleaseAreaOfOfficeSpace us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:SubleaseAreaOfOfficeSpace

krtx:BostonMassachusetts, krtx:OfficeSpace

Period End	2021-03-31
Value	25445.0
Percentage of SubleaseAreaOfOfficeSpace	100.0

krtx:SubleaseSquareFeet us-gaap:PropertyPlantAndEquipmentByType

krtx:SubleaseSquareFeet

krtx:Premises

Period End	2021-04-30
Value	1751.0
Percentage of SubleaseSquareFeet	100.0

krtx:SubleaseSquareFeet us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

krtx:Boston, krtx:Headquarters

Period End	2021-06-30
Value	7050.0
Percentage of SubleaseSquareFeet	0.0

krtx:Boston, krtx:OfficeSpace

Period End	2021-03-31
Value	7050.0
Percentage of SubleaseSquareFeet	0.0

us-gaap:AccountsPayableRelatedPartiesCurrent

Period End	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	0	0	0	51000.0	10000.0	8000.0	112000.0
Percentage of AccountsPayableRelatedPartiesCurrent	0.0	0.0	0.0	100.0	100.0	100.0	100.0

us-gaap:AccruedProfessionalFeesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	588000.0	375000.0	458000.0	338000.0	267000.0	142000.0	229000.0	530000.0	75000.0
Percentage of AccruedProfessionalFeesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AociBeforeTaxAttributableToParent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31
Value	-5000.0	9000.0	39000.0	897000.0	1571000.0	5000.0
Percentage of AociBeforeTaxAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0

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

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	356	435	222	318	365	377	152	72	10
Percentage of AssetsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30
Value	167	129	96	35
Percentage of AssetsFairValueDisclosure	47.1	29.8	43.6	11.3

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	524	564	319	354	365	377	152	72	10
Percentage of AssetsFairValueDisclosure	147.1	129.8	143.6	111.3	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost us-gaap:CashAndCashEquivalents

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:CommercialPaper

Period End	2021-06-30	2021-03-31	2020-12-31
Value	110	88	60
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31	2020-12-31
Value	31	24	36
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	28.7	27.7	61.2

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue us-gaap:CashAndCashEquivalents

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:CommercialPaper

Period End	2021-06-30	2021-03-31	2020-12-31
Value	110	88	60
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31	2020-12-31
Value	31	24	36
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	28.7	27.7	61.2

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2021-03-31
Value	12
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0

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

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	326	335	50	116	173	197	22	7.291
Percentage of CashAndCashEquivalentsFairValueDisclosure	0.0	2792.9	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommercialPaper, us-gaap:FairValueMeasurementsRecurring

Period End	2021-03-31
Value	12
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0

us-gaap:MoneyMarketFunds, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	326	335	50	116	173	197	22	7.291
Percentage of CashAndCashEquivalentsFairValueDisclosure	0.0	2792.9	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	345	353	53	134	190	209	54	10	84	9.027	18	2.56	1.942
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredIncomeTaxLiabilities

Period End	2020-12-31	2019-12-31	2018-12-31
Value	655000.0	27000.0	3000.0
Percentage of DeferredIncomeTaxLiabilities	100.0	100.0	100.0

us-gaap:DeferredOfferingCosts

Period End	2021-06-30	2021-03-31	2020-12-31	2019-06-30
Value	405000.0	405000.0	405000.0	2032000.0
Percentage of DeferredOfferingCosts	100.0	100.0	100.0	100.0

us-gaap:DeferredOfferingCosts us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, krtx:FollowOnPublicOffering

Period End	2021-03-04
Value	200000.0
Percentage of DeferredOfferingCosts	0.0

us-gaap:DeferredTaxAssetsGross

Period End	2020-12-31	2019-12-31	2018-12-31
Value	60	21	7.125
Percentage of DeferredTaxAssetsGross	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

Period End	2020-12-31	2019-12-31	2018-12-31
Value	47	14	6.288
Percentage of DeferredTaxAssetsOperatingLossCarryforwards	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

Period End	2020-12-31	2019-12-31	2018-12-31
Value	5613000.0	3028000.0	537000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwards	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

Period End	2020-12-31	2019-12-31	2018-12-31
Value	5923000.0	3613000.0	166000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

Period End	2020-12-31	2019-12-31	2018-12-31
Value	22000.0	27000.0	3000.0
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment	100.0	100.0	100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	2068000.0	1047000.0	2654000.0	1090000.0	572000.0	1823000.0	839000.0	540000.0	311000.0
Percentage of EmployeeRelatedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

Period End	2021-06-30	2021-03-31	2020-12-31
Value	84	86	46
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	100.0	100.0	100.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:InvestmentsFairValueDisclosure

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31
Value	110	88	60
Percentage of InvestmentsFairValueDisclosure	100.0	100.0	100.0

us-gaap:USTreasurySecurities, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2019-06-30	2018-12-31
Value	30	99	172	180	64	4.983
Percentage of InvestmentsFairValueDisclosure	27.2	112.3	286.3	0.0	0.0	0.0

us-gaap:InvestmentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommercialPaper, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31
Value	110	88	60
Percentage of InvestmentsFairValueDisclosure	100.0	100.0	100.0

us-gaap:USTreasurySecurities, us-gaap:FairValueMeasurementsRecurring

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2019-06-30	2018-12-31
Value	30	99	172	180	64	4.983
Percentage of InvestmentsFairValueDisclosure	27.2	112.3	286.3	0.0	0.0	0.0

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

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

Period End	2021-06-30	2021-03-31	2020-12-31
Value	57	28	36
Percentage of InvestmentsFairValueDisclosure	52.1	32.3	61.2

us-gaap:InvestmentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateDebtSecurities

Period End	2021-06-30	2021-03-31	2020-12-31
Value	57	28	36
Percentage of InvestmentsFairValueDisclosure	52.1	32.3	61.2

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

Period End	2021-06-30	2021-03-31	2020-12-31
Value	2547000.0	1001000.0	982000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	100.0	100.0	100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

Period End	2021-06-30	2021-03-31
Value	1128000.0	738000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceived

Period End	2021-06-30
Value	272000.0
Percentage of LessorOperatingLeasePaymentsToBeReceived	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

Period End	2021-06-30
Value	108000.0
Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear

Period End	2021-06-30
Value	54000.0
Percentage of LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

Period End	2021-06-30
Value	110000.0
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears	100.0

us-gaap:MarketableSecurities

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	197	217	269	180
Percentage of MarketableSecurities	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31
Value	5.91	6.21	6.21	6.16	6.16
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry

Period End	2020-12-31	2019-12-31
Value	179	51
Percentage of OperatingLossCarryforwards	100.0	100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority, us-gaap:TaxPeriod

us-gaap:DomesticCountry, krtx:IndefiniteCarryforward

Period End	2020-12-31	2019-12-31
Value	170	42
Percentage of OperatingLossCarryforwards	94.6	81.3

us-gaap:StateAndLocalJurisdiction, krtx:BeginToExpireInTwentyThirty

Period End	2020-12-31	2019-12-31
Value	151	51
Percentage of OperatingLossCarryforwards	84.4	99.6

us-gaap:PrepaidExpenseAndOtherAssetsNoncurrent

Period End	2021-06-30	2021-03-31
Value	300000.0	600000.0
Percentage of PrepaidExpenseAndOtherAssetsNoncurrent	100.0	100.0

us-gaap:PrepaidInsurance

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	46000.0	1053000.0	2116000.0	23000.0	1050000.0	2130000.0	1741000.0	23000.0
Percentage of PrepaidInsurance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedCashNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	261000.0	261000.0	157000.0	123000.0
Percentage of RestrictedCashNoncurrent	100.0	100.0	100.0	100.0

us-gaap:SecurityDepositLiability us-gaap:StatementGeographical, us-gaap:BalanceSheetLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:SecurityDepositLiability

krtx:Boston, us-gaap:OtherNoncurrentLiabilities, krtx:Headquarters

Period End	2021-06-30
Value	100000.0
Percentage of SecurityDepositLiability	100.0

krtx:Boston, us-gaap:OtherNoncurrentLiabilities, krtx:OfficeSpace

Period End	2021-03-31
Value	100000.0
Percentage of SecurityDepositLiability	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31	2020-12-31
Value	17.66	14.12	10.48
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	377	415	336	420	282	306	36	53	6.42
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

Period End	2021-06-30	2021-03-31	2020-12-31
Value	377	415	336
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice

Period End	2021-06-30	2021-03-31	2020-12-31
Value	42.91	41.21	28.63
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	100.0	100.0	100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

Period End	2021-06-30	2021-03-31	2020-12-31
Value	310	328	260
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100.0	100.0	100.0

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

us-gaap:TaxCreditCarryforwardAmount

us-gaap:DomesticCountry, us-gaap:Research

Period End	2020-12-31	2019-12-31
Value	5000000.0	2800000.0
Percentage of TaxCreditCarryforwardAmount	100.0	100.0

us-gaap:StateAndLocalJurisdiction, us-gaap:Research

Period End	2020-12-31	2019-12-31
Value	800000.0	300000.0
Percentage of TaxCreditCarryforwardAmount	16.0	10.7

Line plots across dimensions of each concept

TTM Greenblatt ROC
_
(None,)

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)

KRTX

Table of contents

Plots across concepts

Tables

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense

us-gaap:ResearchAndDevelopmentExpense

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense

Assets

us-gaap:Assets

us-gaap:Assets

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

us-gaap:AdditionalPaidInCapital

us-gaap:CommonStock

us-gaap:RetainedEarnings

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross