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v3.22.4

Subsequent Events - Additional Information (Details) $ in Millions | Mar. 10, 2023 USD ($)
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Subsequent Event | Initial Lease Agreement and Additional Lease Agreement |
Subsequent Event [Line Items] |
Amount held as collateral for letters of credit issued to landlord | $ 2.7

X
- Definition Amount held as collateral for letters of credit issued to landlord. + References No definition available. + Details
Name: | nktx_AmountHeldAsCollateralForLettersOfCreditIssuedToLandlord
Namespace Prefix: | nktx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=nktx_InitialLeaseAgreementAndAdditionalLeaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |