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License and Collaboration Agreements - License, Collaboration and Other Revenue (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | $ 153,289 nktr_LicenseCollaborationOtherRevenue | $ 80,872 nktr_LicenseCollaborationOtherRevenue | $ 30,127 nktr_LicenseCollaborationOtherRevenue
AstraZeneca AB [Member] | MOVANTIKTM (NKTR-118) and MOVANTIKTM fixed-dose combination program (NKTR-119) [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 105,001 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AstraZenecaAbMember / us-gaap_TypeOfArrangementAxis = nktr_MovantikAndMovantikFixedDoseCombinationProgramMember | 25,016 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AstraZenecaAbMember / us-gaap_TypeOfArrangementAxis = nktr_MovantikAndMovantikFixedDoseCombinationProgramMember | 59 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AstraZenecaAbMember / us-gaap_TypeOfArrangementAxis = nktr_MovantikAndMovantikFixedDoseCombinationProgramMember
Roche [Member] | PEGASYS and MIRCERA [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 12,845 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_RocheMember / us-gaap_TypeOfArrangementAxis = nktr_PegasysAndMirceraMember | 18,382 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_RocheMember / us-gaap_TypeOfArrangementAxis = nktr_PegasysAndMirceraMember | 7,146 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_RocheMember / us-gaap_TypeOfArrangementAxis = nktr_PegasysAndMirceraMember
Baxter Healthcare [Member] | BAX 855 (Hemophilia) [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 10,258 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BaxterHealthcareMember / us-gaap_TypeOfArrangementAxis = nktr_HemophiliaMember | 1,702 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BaxterHealthcareMember / us-gaap_TypeOfArrangementAxis = nktr_HemophiliaMember | 6,238 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BaxterHealthcareMember / us-gaap_TypeOfArrangementAxis = nktr_HemophiliaMember
Amgen, Inc. [Member] | Neulasta [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 5,000 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AmgenIncMember / us-gaap_TypeOfArrangementAxis = nktr_NeulastaMember | 5,035 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AmgenIncMember / us-gaap_TypeOfArrangementAxis = nktr_NeulastaMember | 5,000 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AmgenIncMember / us-gaap_TypeOfArrangementAxis = nktr_NeulastaMember
Bayer Healthcare LLC [Member] | BAY41-6551 (Amikacin Inhale) [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 4,717 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BayerHealthcareLlcMember / us-gaap_TypeOfArrangementAxis = nktr_BayFourOneSixFiveFiveOneAmikacinInhaleMember | 15,293 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BayerHealthcareLlcMember / us-gaap_TypeOfArrangementAxis = nktr_BayFourOneSixFiveFiveOneAmikacinInhaleMember | 2,971 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_BayerHealthcareLlcMember / us-gaap_TypeOfArrangementAxis = nktr_BayFourOneSixFiveFiveOneAmikacinInhaleMember
Affymax, Inc. [Member] | OMONTYS [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue |  | 7,149 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AffymaxIncMember / us-gaap_TypeOfArrangementAxis = nktr_OmontysMember | 2,829 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_AffymaxIncMember / us-gaap_TypeOfArrangementAxis = nktr_OmontysMember
Other [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | $ 15,468 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_OtherPartnerMember | $ 8,295 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_OtherPartnerMember | $ 5,884 nktr_LicenseCollaborationOtherRevenue / dei_LegalEntityAxis = nktr_OtherPartnerMember

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- Definition Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Revenue may contain one or more of the following elements: upfront fees, contract research, milestone payments, manufacturing and supply, royalties, and license fees. + References No definition available. + Details
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