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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Statement of Cash Flows [Abstract] |
Sale of future royalties transaction costs | $ 3.8

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- Definition Sale of Future Royalties Transaction Costs + References No definition available. + Details
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Namespace Prefix: | nktr_
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration