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Liabilities Related to Sales of Future Royalties - Additional Information (Details) | Mar. 31, 2022
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2012 Purchase and Sale Agreement |
Liability Related to Sale of Future Royalties [Line Items] |
Royalties liability discount rate | 0.16
2020 Purchase and Sale Agreement |
Liability Related to Sale of Future Royalties [Line Items] |
Royalties liability discount rate | 0.15

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- Definition Liability related to sale of future royalties. + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Royalties Liability, Measurement Input + References No definition available. + Details
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Namespace Prefix: | nktr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=nktr_PurchaseAndSaleAgreement2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |