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Subsequent Events - Additional Information (Details) $ in Millions	Mar. 10, 2023 USD ($)
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: