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v3.22.4

Operating Leases - Schedule of Operating Lease Information (Details) | 12 Months Ended
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Dec. 31, 2022 term
Mission Bay Facility |
Leases [Line Items] |
Number of consecutive terms to extend lease | 2
Lease extension term | 5 years
Third Street Facility |
Leases [Line Items] |
Number of consecutive terms to extend lease | 1
Lease extension term | 5 years

X
- Definition Lease extension term. + References No definition available. + Details
Name: | nktr_LeaseExtensionTerm
Namespace Prefix: | nktr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Leases [Line Items] + References No definition available. + Details
Name: | nktr_LeasesLineItems
Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of consecutive five year terms to extend lease. + References No definition available. + Details
Name: | nktr_NumberOfConsecutiveTermsToExtendLease
Namespace Prefix: | nktr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=nktr_MissionBayLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=nktr_ThirdStreetLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |