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License and Collaboration Agreements - License, Collaboration and Other Revenue (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | $ 16,975 | $ 1,097,265 | $ 210,965
Collaboration agreements completion date | Dec. 31, 2017 |  |
Bristol-Myers Squibb | NKTR-214 |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | $ 0 | 1,059,768 | 0
Eli Lilly and Company | NKTR-358 |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 7,019 | 11,634 | 130,087
Amgen, Inc. | Neulasta |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 5,000 | 5,000 | 5,000
Baxalta Incorporated / Takeda | Hemophilia, Including ADYNOVATE and ADYNOVITM |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 378 | 20,328 | 11,443
Ophthotech Corporation | Fovista |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 0 | 0 | 19,123
Bayer Healthcare LLC | BAY41-6551 (Amikacin Inhale) |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 0 | 0 | 17,931
AstraZeneca AB | MOVANTIK and MOVENTIG |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | 0 | 0 | 4,600
Other |  |  |
License And Collaboration Agreements [Line Items] |  |  |
License, collaboration and other revenue | $ 4,578 | $ 535 | $ 22,781

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