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Liability Related to Sale of Future Royalties - Summary of Liability Related to Potential Future Royalties (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 34 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Other Liabilities Disclosure [Abstract] |  |  |  |
Liability related to sale of future royalties-beginning balance | $ 128,520 nktr_LiabilityRelatedToSaleOfPotentialFutureRoyalties |  |  |
Proceeds from sale of future royalties |  |  |  | 124,000 nktr_ProceedsFromSaleOfPotentialFutureRoyalties
Payments from Nektar to RPI | (7,000)nktr_PartialRepaymentOfRoyaltySaleProceeds |  |  | (10,000)nktr_PartialRepaymentOfRoyaltySaleProceeds
Non-cash CIMZIA® and MIRCERA®royalty revenue | (21,937)nktr_NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties | (22,055)nktr_NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties | (10,791)nktr_NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties | (54,783)nktr_NonCashRoyaltyRevenueRelatedToSaleOfFutureRoyalties
Non-cash interest expense recognized | 20,888 nktr_NonCashInterestExpenseRelatedToSaleOfRoyalties | 22,309 nktr_NonCashInterestExpenseRelatedToSaleOfRoyalties | 18,057 nktr_NonCashInterestExpenseRelatedToSaleOfRoyalties | 61,254 nktr_NonCashInterestExpenseRelatedToSaleOfRoyalties
Liability related to sale of future royalties - ending balance | $ 120,471 nktr_LiabilityRelatedToSaleOfPotentialFutureRoyalties | $ 128,520 nktr_LiabilityRelatedToSaleOfPotentialFutureRoyalties |  | $ 120,471 nktr_LiabilityRelatedToSaleOfPotentialFutureRoyalties

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