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Co-Development Agreement with SFJ Pharmaceuticals and Development Derivative Liability - Additional Information (Details) - SFJ Pharmaceuticals | Feb. 12, 2021 USD ($)
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Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Committed funding | $ 150,000,000
Collaborative arrangement, success-based payments | $ 637,500,000

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- Definition Collaborative Arrangement, Committed Funding + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Arrangement, Success-Based Payments, Amount + References No definition available. + Details
Name: | nktr_CollaborativeArrangementSuccessBasedPaymentsAmount
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=nktr_SFJPharmaceuticalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |