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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 | 70 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Other Liabilities Disclosure [Abstract] |  |  |  |
Liability related to the sale of future royalties—beginning balance | $ 108,584 |  |  | $ 0
Proceeds from sale of future royalties | 0 |  |  | 124,000
Payments from Nektar to RPI | 0 |  |  | (10,000)
Non-cash CIMZIA® and MIRCERA® royalty revenue | (30,531) | $ (30,158) | $ (22,058) | (137,531)
Non-cash interest expense recognized | 18,869 | 19,712 | $ 20,619 | 120,453
Liability related to the sale of future royalties – ending balance | 96,922 | 108,584 |  | 96,922
Less: unamortized transaction costs | (2,267) |  |  | (2,267)
Liability related to the sale of future royalties, net | $ 94,655 | $ 105,950 |  | $ 94,655

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- Definition Liabilities on sale of future royalties, unamortized transaction costs. + References No definition available. + Details
Name: | nktr_LiabilitiesOnSaleOfFutureRoyaltiesUnamortizedTransactionCosts
Namespace Prefix: | nktr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Liability related to sale of potential future royalties noncurrent. + 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 Liability related to sale of potential future royalties non current net of issuance costs. + References No definition available. + Details
Name: | nktr_LiabilityRelatedToSaleOfPotentialFutureRoyaltiesNonCurrentNetOfIssuanceCosts
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