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Liability Related to the Sale of Future Royalties - Summary of Liability Related to Potential Future Royalties (Detail) - USD ($) $ in Thousands | 12 Months Ended | 46 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Other Liabilities Disclosure [Abstract] |  |  |  |
Liability related to the sale of future royalties—beginning balance | $ 120,471 |  |  | $ 0
Proceeds from sale of future royalties |  |  |  | 124,000
Payments from Nektar to RPI |  |  |  | (10,000)
Non-cash CIMZIA® and MIRCERA® royalty revenue | (22,058) | $ (21,937) | $ (22,055) | (76,841)
Non-cash interest expense recognized | 20,619 | 20,888 | $ 22,309 | 81,873
Liability related to the sale of future royalties – ending balance | $ 119,032 | $ 120,471 |  | $ 119,032

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- Definition Liability Related To Sale Of Potential Future Royalties Non Current + References No definition available. + Details
Name: | nktr_LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrent
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Non-cash interest expense related to sale of royalties. + References No definition available. + Details
Name: | nktr_NonCashInterestExpenseRelatedToSaleOfRoyalties
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Non cash royalty revenue related to sale future royalties. + References No definition available. + Details
Name: | nktr_NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Partial repayment of royalty sale proceeds. + References No definition available. + Details
Name: | nktr_PartialRepaymentOfRoyaltySaleProceeds
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from sale of potential future royalties. + References No definition available. + Details
Name: | nktr_ProceedsFromSaleOfPotentialFutureRoyalties
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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