NKTX


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

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockParOrStatedValuePerShare
us-gaap:SubsequentEventType

us-gaap:PreferredStockParOrStatedValuePerShare
us-gaap:SubsequentEventType
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding

us-gaap:CommonStockSharesIssued
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStockSharesAuthorized
us-gaap:SubsequentEventType

us-gaap:PreferredStockSharesAuthorized
us-gaap:StatementClassOfStock
us-gaap:SubsequentEventType

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:OperatingExpenses

us-gaap:ResearchAndDevelopmentExpense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

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:CashAndCashEquivalents
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:OtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesNoncurrent
us-gaap:AwardType

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

nktx:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCommonStockFairValue
us-gaap:StatementEquityComponents
nktx:StockIssuedDuringPeriodSharesVestingOfSharesOfCommonStockSubjectToRepurchase

nktx:StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase
us-gaap:StatementEquityComponents

nktx:WeightedAverageNumberOfSharesUnvestedCommonStockIssuedUponEarlyExerciseOfCommonStockOptions

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:InvestmentIncomeInterest

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:ProceedsFromIssuanceOfConvertiblePreferredStock

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

nktx:DeferredOfferingCostsNoncurrent

nktx:DeferredOfferingCostsRelatedLiabilitiesCurrent

nktx:PreferredStockPurchaseRightLiability

nktx:PreferredStockPurchaseRightLiabilityFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

nktx:PropertyAndEquipmentLiabilitiesCurrent

nktx:ResearchAndDevelopmentLiabilitiesCurrent

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType
us-gaap:CashAndCashEquivalents, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:CashAndCashEquivalents, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
us-gaap:AwardType
us-gaap:StatementClassOfStock
us-gaap:SubsidiarySaleOfStock

us-gaap:DepositsAssetsNoncurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:MoneyMarketFundsAtCarryingValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:PrepaidExpenseCurrent

us-gaap:RestrictedCash

us-gaap:RestrictedCashNoncurrent
us-gaap:AwardType
us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
us-gaap:StatementClassOfStock
us-gaap:TemporaryEquityCarryingAmountAttributableToParent
us-gaap:StatementClassOfStock
us-gaap:TemporaryEquitySharesOutstanding

Plots across concepts


Expenses
Income Tax Expense Benefit
Balance Sheet
Stockholders Equity
Assets
Property Plant And Equipment Net
Current Assets
Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities And Stockholders Equity
Current Liabilities
Other Accrued Liabilities Current
Stockholders Equity
Retained Earnings Accumulated Deficit
NonoperatingIncomeExpense
Nonoperating Income Expense

Tables

  2020-06-302019-12-31
us-gaap:CommonStockValue █▁0.0001750.00016
us-gaap:CommonStockParOrStatedValuePerShare ▄1e-10NA
us-gaap:PreferredStockParOrStatedValuePerShare ▄1e-10NA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock█▁1.7505011.600601
us-gaap:CommonStockSharesIssued ▄1.750501NA
us-gaap:CommonStockSharesAuthorized ▄71.919982NA
us-gaap:PreferredStockSharesAuthorized ▄54.350179NA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted ▄1.69856NA
us-gaap:EarningsPerShareBasicAndDiluted ▄-30.06NA
  2020-06-302019-12-31
  2020-06-302019-12-31
 TTM Greenblatt ROC _ _NANA
  2020-06-302019-12-31
us-gaap:OperatingExpenses ▄10.355581NA
us-gaap:ResearchAndDevelopmentExpense ▄7.861986NA
us-gaap:GeneralAndAdministrativeExpense ▄2.493595NA
us-gaap:OperatingIncomeLoss ▄-10.355581NA
us-gaap:OtherNonoperatingIncomeExpense ▄0.004288NA
us-gaap:NonoperatingIncomeExpense ▄-40.709536NA
us-gaap:NetIncomeLoss ▄-51.065117NA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▄-51.065117NA
us-gaap:ComprehensiveIncomeNetOfTax ▄-51.060543NA
  2020-06-302019-12-31
  2020-06-302019-12-31
us-gaap:Assets ▁█43.61573948.411752
us-gaap:Liabilities █▁67.68980114.079381
us-gaap:LiabilitiesAndStockholdersEquity ▁█43.61573948.411752
us-gaap:StockholdersEquity ▁█-83.888944-25.482511
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome█▁0.001032-0.002139
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█▁2.5407111.17921
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█▁0.0001750.00016
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-86.430862-26.659742
  2020-06-302019-12-31
us-gaap:AssetsCurrent ▁█22.29749337.465044
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁█17.74892820.606849
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄18.161842NA
us-gaap:ShortTermInvestments ▁█3.89714816.384273
us-gaap:OtherAssetsCurrent ▁█0.0245190.066508
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▁0.6514170.473922
  2020-06-302019-12-31
us-gaap:PropertyPlantAndEquipmentGross █▁8.6777333.724918
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▁0.9267980.645393
us-gaap:PropertyPlantAndEquipmentNet █▁7.7509353.079525
us-gaap:OperatingLeaseRightOfUseAsset █▁9.0169927.14357
us-gaap:OtherAssetsNoncurrent █▁4.1374050.455078
  2020-06-302019-12-31
us-gaap:LiabilitiesCurrent █▁59.7437298.164615
us-gaap:AccountsPayableCurrent ▁█1.7335611.881665
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent █▁4.6022093.289492
us-gaap:OtherAccruedLiabilitiesCurrent █▁0.8710340.591294
us-gaap:AccruedLiabilitiesCurrent █▁4.6022093.289492
us-gaap:OperatingLeaseLiabilityCurrent █▁1.5215091.515813
  2020-06-302019-12-31
us-gaap:OtherLiabilitiesNoncurrent ▁█0.1199630.134372
us-gaap:OperatingLeaseLiabilityNoncurrent █▁7.8261095.780394
  2020-06-302019-12-31
us-gaap:StockholdersEquity ▁█-83.888944-25.482511
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome█▁0.001032-0.002139
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█▁2.5407111.17921
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█▁0.0001750.00016
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█-86.430862-26.659742
us-gaap:CommonStockValue █▁0.0001750.00016
us-gaap:AdditionalPaidInCapitalCommonStock █▁2.5407111.17921
us-gaap:RetainedEarningsAccumulatedDeficit ▁█-86.430862-26.659742
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▁0.001032-0.002139
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▄0.566085NA
  2020-06-302019-12-31
  2020-06-302019-12-31
us-gaap:NetIncomeLoss ▄-51.065117NA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▄-51.065117NA
us-gaap:ShareBasedCompensation ▄0.6NA
  2020-06-302019-12-31
  2020-06-302019-12-31
  2020-06-302019-12-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2020-06-302019-12-31
Value175.0160.0
Percentage of CommonStockValue100.0100.0
Percentage of Assets0.00.0

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockParOrStatedValuePerShare


Common
Period End2020-06-30
Value0.0001
Percentage of CommonStockParOrStatedValuePerShare100.0

us-gaap:CommonStockParOrStatedValuePerShare us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Common
Period End2020-07-01
Value0.0001
Percentage of CommonStockParOrStatedValuePerShare0.0

Preferred Stock Par Or Stated Value Per Share

us-gaap:PreferredStockParOrStatedValuePerShare

us-gaap:PreferredStockParOrStatedValuePerShare


Preferred
Period End2020-06-30
Value0.0001
Percentage of PreferredStockParOrStatedValuePerShare100.0

us-gaap:PreferredStockParOrStatedValuePerShare us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Preferred
Period End2020-07-01
Value0.0001
Percentage of PreferredStockParOrStatedValuePerShare0.0

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value1750500.01621000.01600600.01462500.01366400.01231800.0
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2020-06-30
Value1.750501
Percentage of CommonStockSharesIssued100.0

us-gaap:CommonStockSharesIssued us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:SubsequentEvent, us-gaap:IPO


Common
Period End2020-07-14
Value16
Percentage of CommonStockSharesIssued0.0

us-gaap:SubsequentEvent, us-gaap:OverAllotmentOption


Common
Period End2020-07-14
Value2.1
Percentage of CommonStockSharesIssued0.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2020-06-30
Value71
Percentage of CommonStockSharesAuthorized100.0

us-gaap:CommonStockSharesAuthorized us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Common
Period End2020-07-01
Value100
Percentage of CommonStockSharesAuthorized0.0

Preferred Stock Shares Authorized

us-gaap:PreferredStockSharesAuthorized

us-gaap:PreferredStockSharesAuthorized


Preferred
Period End2020-06-30
Value54
Percentage of PreferredStockSharesAuthorized100.0

us-gaap:PreferredStockSharesAuthorized us-gaap:StatementClassOfStock

nktx:SeriesAConvertiblePreferredStock


Preferred
Period End2020-06-30
Value6.170349
Percentage of PreferredStockSharesAuthorized11.4

nktx:SeriesBConvertiblePreferredStock


Preferred
Period End2020-06-30
Value48
Percentage of PreferredStockSharesAuthorized88.6

us-gaap:PreferredStockSharesAuthorized us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Preferred
Period End2020-07-01
Value54
Percentage of PreferredStockSharesAuthorized0.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2020-06-302019-06-30
Value1698600.01427000.0
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2020-06-302019-06-30
Value-30.06-3.39
Percentage of EarningsPerShareBasicAndDiluted100.0100.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2020-06-302019-06-30
Value104.67313
Percentage of OperatingExpenses100.0100.0
Percentage of Revenues0.00.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2020-06-302019-06-30
Value7.8619863.620858
Percentage of ResearchAndDevelopmentExpense100.0100.0
Percentage of Revenues0.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2020-06-302019-06-30
Value2493600.01052300.0
Percentage of GeneralAndAdministrativeExpense100.0100.0
Percentage of Revenues0.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2020-06-302019-06-30
Value-10356000.0-4670800.0
Percentage of OperatingIncomeLoss100.0100.0
Percentage of Revenues0.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2020-06-30
Value4288.0
Percentage of OtherNonoperatingIncomeExpense100.0
Percentage of Revenues0.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2020-06-302019-06-30
Value-40710000.0-167130.0
Percentage of NonoperatingIncomeExpense100.0100.0
Percentage of Revenues0.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2020-06-302020-03-312019-06-302019-03-31
Value-51065000.0-8706000.0-4838000.0-3083000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2020-06-302020-03-312019-06-302019-03-31
Value-51065000.0-8706000.0-4838000.0-3083000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2020-06-302019-06-30
Value-51061000.0-4838000.0
Percentage of ComprehensiveIncomeNetOfTax100.0100.0
Percentage of Revenues0.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2020-06-302019-12-31
Value4348
Percentage of Assets100.0100.0
Percentage of Assets100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2020-06-302019-12-31
Value6714
Percentage of Liabilities100.0100.0
Percentage of Assets155.229.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2020-06-302019-12-31
Value4348
Percentage of LiabilitiesAndStockholdersEquity100.0100.0
Percentage of Assets100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value-83889000.0-33694000.0-25483000.0-13137000.0-8391700.0-5396000.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets-192.30.0-52.60.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2020-06-302020-03-312019-12-31
Value1032.0-3542.0-2139.0
Percentage of StockholdersEquity-0.00.00.0
Percentage of Assets0.00.0-0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value2540700.01675300.01179200.0367390.0275090.0187790.0
Percentage of StockholdersEquity-3.0-5.0-4.6-2.8-3.3-3.5
Percentage of Assets5.80.02.40.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value175.0162.0160.0146.0136.0123.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value-86431000.0-35366000.0-26660000.0-13505000.0-8666900.0-5583900.0
Percentage of StockholdersEquity103.0105.0104.6102.8103.3103.5
Percentage of Assets-198.20.0-55.10.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2020-06-302019-12-31
Value2237
Percentage of AssetsCurrent100.0100.0
Percentage of Assets51.177.4

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2020-06-302019-12-312019-06-30
Value17205.913862
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0
Percentage of Assets40.742.60.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2020-06-302019-06-30
Value186.182397
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0
Percentage of Assets41.60.0

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2020-06-302019-12-31
Value3.89714816
Percentage of ShortTermInvestments100.0100.0
Percentage of Assets8.933.8

us-gaap:ShortTermInvestments us-gaap:CashAndCashEquivalents

us-gaap:CommercialPaper


Short
Period End2020-06-302019-12-31
Value2.69555210
Percentage of ShortTermInvestments69.263.2
Percentage of Assets6.221.4
Percentage of Assets us-gaap:CommercialPaper0.00.0

us-gaap:ShortTermInvestments us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2


Short
Period End2020-06-302019-12-31
Value2.69555210
Percentage of ShortTermInvestments69.263.2
Percentage of Assets6.221.4
Percentage of Assets us-gaap:CommercialPaper us-gaap:FairValueInputsLevel20.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Short
Period End2020-06-302019-12-31
Value3.89714816
Percentage of ShortTermInvestments100.0100.0
Percentage of Assets8.933.8
Percentage of Assets us-gaap:FairValueInputsLevel20.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:CorporateDebtSecurities


Short
Period End2020-06-302019-12-31
Value1.2015966.02658
Percentage of ShortTermInvestments30.836.8
Percentage of Assets2.812.4
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:CorporateDebtSecurities0.00.0

us-gaap:ShortTermInvestments us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Short
Period End2020-06-302019-12-31
Value1.2015966.02658
Percentage of ShortTermInvestments30.836.8
Percentage of Assets2.812.4
Percentage of Assets us-gaap:CorporateDebtSecurities0.00.0

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2020-06-302019-12-31
Value24519.066508.0
Percentage of OtherAssetsCurrent100.0100.0
Percentage of Assets0.10.1

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2020-06-302019-12-31
Value651420.0473920.0
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0
Percentage of Assets1.51.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-06-302019-12-31
Value8677700.03724900.0
Percentage of PropertyPlantAndEquipmentGross100.0100.0
Percentage of Assets19.97.7

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

nktx:ResearchEquipment


Property
Period End2020-06-302019-12-31
Value4751500.02928700.0
Percentage of PropertyPlantAndEquipmentGross54.878.6
Percentage of Assets10.96.0
Percentage of Assets nktx:ResearchEquipment0.00.0

us-gaap:ConstructionInProgress


Property
Period End2020-06-302019-12-31
Value3300700.0183500.0
Percentage of PropertyPlantAndEquipmentGross38.04.9
Percentage of Assets7.60.4
Percentage of Assets us-gaap:ConstructionInProgress0.00.0

us-gaap:FurnitureAndFixtures


Property
Period End2020-06-302019-12-31
Value277670.0264830.0
Percentage of PropertyPlantAndEquipmentGross3.27.1
Percentage of Assets0.60.5
Percentage of Assets us-gaap:FurnitureAndFixtures0.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-06-302019-12-31
Value926800.0645390.0
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0
Percentage of Assets2.11.3

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-06-302019-12-31
Value7750900.03079500.0
Percentage of PropertyPlantAndEquipmentNet100.0100.0
Percentage of Assets17.86.4

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-06-302019-12-31
Value9017000.07143600.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0
Percentage of Assets20.714.8

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2020-06-302019-12-31
Value4137400.0455080.0
Percentage of OtherAssetsNoncurrent100.0100.0
Percentage of Assets9.50.9

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2020-06-302019-12-31
Value598.164615
Percentage of LiabilitiesCurrent100.0100.0
Percentage of Assets137.016.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2020-06-302019-12-31
Value1733600.01881700.0
Percentage of AccountsPayableCurrent100.0100.0
Percentage of Assets4.03.9

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2020-06-302019-12-31
Value4602200.03289500.0
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0
Percentage of Assets10.66.8

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-06-302019-12-31
Value871030.0591290.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0
Percentage of Assets2.01.2

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2020-06-302019-12-31
Value4602200.03289500.0
Percentage of AccruedLiabilitiesCurrent100.0100.0
Percentage of Assets10.66.8

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-06-302019-12-31
Value1521500.01515800.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets3.53.1

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2020-06-302019-12-31
Value119960.0134370.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0
Percentage of Assets0.30.3

us-gaap:OtherLiabilitiesNoncurrent us-gaap:AwardType

us-gaap:RestrictedStock


Other
Period End2020-06-302019-12-31
Value74817.089227.0
Percentage of OtherLiabilitiesNoncurrent62.466.4
Percentage of Assets0.20.2
Percentage of Assets us-gaap:RestrictedStock0.00.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-06-302019-12-31
Value7826100.05780400.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0
Percentage of Assets17.911.9

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value-83889000.0-33694000.0-25483000.0-13137000.0-8391700.0-5396000.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets-192.30.0-52.60.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2020-06-302020-03-312019-12-31
Value1032.0-3542.0-2139.0
Percentage of StockholdersEquity-0.00.00.0
Percentage of Assets0.00.0-0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value2540700.01675300.01179200.0367390.0275090.0187790.0
Percentage of StockholdersEquity-3.0-5.0-4.6-2.8-3.3-3.5
Percentage of Assets5.80.02.40.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value175.0162.0160.0146.0136.0123.0
Percentage of StockholdersEquity-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value-86431000.0-35366000.0-26660000.0-13505000.0-8666900.0-5583900.0
Percentage of StockholdersEquity103.0105.0104.6102.8103.3103.5
Percentage of Assets-198.20.0-55.10.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2020-06-302019-12-31
Value175.0160.0
Percentage of CommonStockValue100.0100.0
Percentage of Assets0.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2020-06-302019-12-31
Value2540700.01179200.0
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0
Percentage of Assets5.82.4

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2020-06-302019-12-31
Value-86431000.0-26660000.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0
Percentage of Assets-198.2-55.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2020-06-302019-12-31
Value1032.0-2139.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0
Percentage of Assets0.0-0.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2020-06-302020-03-312019-06-302019-03-31
Value566080.0482060.087566.066878.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2020-06-302020-03-312019-06-302019-03-31
Value566080.0482060.087566.066878.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2020-06-302020-03-312019-06-302019-03-31
Value-51065000.0-8706000.0-4838000.0-3083000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2020-06-302020-03-312019-06-302019-03-31
Value-51065000.0-8706000.0-4838000.0-3083000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2020-06-302019-06-30
Value600000.0100000.0
Percentage of ShareBasedCompensation100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

nktx:TwoThousandTwentyPerformanceIncentiveAndTwoThousandFifteenEquityIncentivePlan


Share
Period End2020-06-302019-12-31
Value2424700.02329500.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

nktx:TwoThousandTwentyPerformanceIncentiveAndTwoThousandFifteenEquityIncentivePlan


Share
Period End2020-06-302019-12-31
Value3.753.59
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0

nktx:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCommonStockFairValue

nktx:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCommonStockFairValue


Share
Period End2020-06-302019-06-30
Value4.334.77
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCommonStockFairValue100.0100.0

nktx:StockIssuedDuringPeriodSharesVestingOfSharesOfCommonStockSubjectToRepurchase us-gaap:StatementEquityComponents

nktx:StockIssuedDuringPeriodSharesVestingOfSharesOfCommonStockSubjectToRepurchase

us-gaap:CommonStock


Stock
Period End2020-06-302020-03-312019-06-302019-03-31
Value19110.017494.096030.0134600.0
Percentage of StockIssuedDuringPeriodSharesVestingOfSharesOfCommonStockSubjectToRepurchase100.0100.0100.0100.0

nktx:StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase

nktx:StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase


Stock
Period End2020-06-302020-03-312019-06-302019-03-31
Value12826.013510.04741.020439.0
Percentage of StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase100.0100.0100.0100.0

nktx:StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-06-302020-03-312019-06-302019-03-31
Value12824.013509.04731.020426.0
Percentage of StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase100.0100.099.899.9

us-gaap:CommonStock


Stock
Period End2020-06-302020-03-312019-06-302019-03-31
Value2.01.010.013.0
Percentage of StockIssuedDuringPeriodValueVestingOfSharesOfCommonStockSubjectToRepurchase0.00.00.20.1

nktx:WeightedAverageNumberOfSharesUnvestedCommonStockIssuedUponEarlyExerciseOfCommonStockOptions

nktx:WeightedAverageNumberOfSharesUnvestedCommonStockIssuedUponEarlyExerciseOfCommonStockOptions


Weighted
Period End2020-06-302019-06-30
Value117270.0163700.0
Percentage of WeightedAverageNumberOfSharesUnvestedCommonStockIssuedUponEarlyExerciseOfCommonStockOptions100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings


Fair
Period End2020-06-30
Value-40741000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2020-06-302019-06-30
Value27176.021855.0
Percentage of InvestmentIncomeInterest100.0100.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2020-06-302019-06-30
Value500000.0300000.0
Percentage of OperatingLeaseExpense100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-06-302019-06-30
Value400000.0200000.0
Percentage of OperatingLeasePayments100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2020-06-30
Value4574.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2020-06-302020-03-31
Value4574.0-1403.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-06-302020-03-31
Value4574.0-1403.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0

us-gaap:ProceedsFromIssuanceOfConvertiblePreferredStock us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:ProceedsFromIssuanceOfConvertiblePreferredStock

nktx:SeriesBConvertiblePreferredStock, us-gaap:SubsequentEvent


Proceeds
Period End2020-07-01
Value64
Percentage of ProceedsFromIssuanceOfConvertiblePreferredStock100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2020-06-302019-06-30
Value0.810.8194
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2020-06-302019-06-30
Value0.00440.0232
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


Stock
Period End2020-06-302020-03-31
Value110420.02871.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2020-06-302020-03-31
Value286550.0482.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-06-302020-03-31
Value286540.0481.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.099.8

us-gaap:CommonStock


Stock
Period End2020-06-302020-03-31
Value11.01.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.00.2

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

us-gaap:WeightedAverageNumberOfSharesIssuedBasic


Weighted
Period End2020-06-302019-06-30
Value1815800.01704200.0
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0

nktx:DeferredOfferingCostsNoncurrent

nktx:DeferredOfferingCostsNoncurrent


Deferred
Period End2020-06-302019-12-31
Value3595200.0104030.0
Percentage of DeferredOfferingCostsNoncurrent100.0100.0

nktx:DeferredOfferingCostsRelatedLiabilitiesCurrent

nktx:DeferredOfferingCostsRelatedLiabilitiesCurrent


Deferred
Period End2020-06-302019-12-31
Value1155000.0104030.0
Percentage of DeferredOfferingCostsRelatedLiabilitiesCurrent100.0100.0

nktx:PreferredStockPurchaseRightLiability

nktx:PreferredStockPurchaseRightLiability


Preferred
Period End2020-06-302019-12-31
Value411.477645
Percentage of PreferredStockPurchaseRightLiability100.0100.0

nktx:PreferredStockPurchaseRightLiabilityFairValueDisclosure

nktx:PreferredStockPurchaseRightLiabilityFairValueDisclosure


Preferred
Period End2020-06-302019-12-31
Value411.477645
Percentage of PreferredStockPurchaseRightLiabilityFairValueDisclosure100.0100.0

nktx:PreferredStockPurchaseRightLiabilityFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


Preferred
Period End2020-06-302019-12-31
Value411.477645
Percentage of PreferredStockPurchaseRightLiabilityFairValueDisclosure100.0100.0

nktx:PropertyAndEquipmentLiabilitiesCurrent

nktx:PropertyAndEquipmentLiabilitiesCurrent


Property
Period End2020-06-302019-12-31
Value354780.0213740.0
Percentage of PropertyAndEquipmentLiabilitiesCurrent100.0100.0

nktx:ResearchAndDevelopmentLiabilitiesCurrent

nktx:ResearchAndDevelopmentLiabilitiesCurrent


Research
Period End2020-06-302019-12-31
Value469280.0702690.0
Percentage of ResearchAndDevelopmentLiabilitiesCurrent100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2020-06-302019-12-31
Value1018
Percentage of AssetsFairValueDisclosure100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2020-06-30
Value6.37438
Percentage of AssetsFairValueDisclosure62.1

us-gaap:FairValueInputsLevel2


Assets
Period End2020-06-302019-12-31
Value3.89714818
Percentage of AssetsFairValueDisclosure37.9100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-06-30
Value1032.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:InvestmentType

us-gaap:ShortTermInvestments


Available
Period End2020-06-30
Value1032.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:CashAndCashEquivalents, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value2.69555210
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value1.2005646.028719
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis44.558.2

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:InvestmentType

us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value3.89611616
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis144.5158.2

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:CashAndCashEquivalents, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value2.69555210
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value1.2015966.02658
Percentage of AvailableForSaleSecuritiesDebtSecurities44.658.2

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:InvestmentType

us-gaap:ShortTermInvestments


Available
Period End2020-06-302019-12-31
Value3.89714816
Percentage of AvailableForSaleSecuritiesDebtSecurities144.6158.2

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent


Available
Period End2020-06-302019-12-31
Value3.89714816
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2020-06-302019-12-312019-06-302018-12-31
Value18206.1823977.956487
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance


Common
Period End2020-06-30
Value9990100.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance100.0

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:AwardType

us-gaap:EmployeeStockOption


Common
Period End2020-06-30
Value2424700.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance24.3

us-gaap:StockCompensationPlan


Common
Period End2020-06-30
Value191360.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance1.9

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:StatementClassOfStock

us-gaap:ConvertiblePreferredStock


Common
Period End2020-06-30
Value7374000.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance73.8

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance us-gaap:SubsidiarySaleOfStock

us-gaap:EmployeeStock


Common
Period End2020-06-30
Value295600.0
Percentage of CommonStockCapitalSharesReservedForFutureIssuance3.0

us-gaap:DepositsAssetsNoncurrent

us-gaap:DepositsAssetsNoncurrent


Deposits
Period End2020-06-302019-12-31
Value542170.0351050.0
Percentage of DepositsAssetsNoncurrent100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-06-302019-12-31
Value1752100.01677700.0
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue


Fair
Period End2020-06-302019-12-312019-08-31
Value411.4776452.8
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue100.0100.0100.0

us-gaap:MoneyMarketFundsAtCarryingValue

us-gaap:MoneyMarketFundsAtCarryingValue


Money
Period End2020-06-30
Value6374400.0
Percentage of MoneyMarketFundsAtCarryingValue100.0

us-gaap:MoneyMarketFundsAtCarryingValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Money
Period End2020-06-30
Value6374400.0
Percentage of MoneyMarketFundsAtCarryingValue100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2020-06-302019-12-31
Value337720.0407410.0
Percentage of PrepaidExpenseCurrent100.0100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2020-06-302019-06-30
Value412910.0268540.0
Percentage of RestrictedCash100.0100.0

us-gaap:RestrictedCashNoncurrent

us-gaap:RestrictedCashNoncurrent


Restricted
Period End2020-06-302019-12-31
Value412910.0268540.0
Percentage of RestrictedCashNoncurrent100.0100.0

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased us-gaap:AwardType

us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased

us-gaap:RestrictedStock


Stock
Period End2020-06-302019-12-31
Value124890.0132250.0
Percentage of StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased100.0100.0

us-gaap:TemporaryEquityCarryingAmountAttributableToParent us-gaap:StatementClassOfStock

us-gaap:TemporaryEquityCarryingAmountAttributableToParent

us-gaap:ConvertiblePreferredStock


Temporary
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value595959121212
Percentage of TemporaryEquityCarryingAmountAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:TemporaryEquitySharesOutstanding us-gaap:StatementClassOfStock

us-gaap:TemporaryEquitySharesOutstanding

us-gaap:ConvertiblePreferredStock


Temporary
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-31
Value2727276.1703496.1703496.170349
Percentage of TemporaryEquitySharesOutstanding100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


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