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License and Collaboration Agreements - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 12, 2024 | Jul. 23, 2017 | Apr. 30, 2018 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue, excluding assessed tax |  |  |  | $ 23,489,000 | $ 20,499,000 | $ 45,128,000 | $ 42,093,000 |
Non-cash royalty revenue related to the sales of future royalties |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue, excluding assessed tax |  |  |  | 16,790,000 | $ 15,832,000 | 32,298,000 | $ 32,693,000 |
Bristol Myers Squibb Company |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Sale of stock shares repurchased | 8,300,000 |  |  |  |  |  |  |
Sale of stock repurchased cash consideration | $ 3,000,000 |  |  |  |  |  |  |
Bristol Myers Squibb Company | Purchase Agreement |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  | 8,284,600 |  |  |  |  |
Sale of stock consideration received |  |  | $ 850,000,000 |  |  |  |  |
Other Partner |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Potential future additional payments for development milestones |  |  |  | $ 40,000,000 |  | $ 40,000,000 |  |
Nektar-358 | Eli Lilly |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 75.00% |  |  |  |  |  |
Nektar-358 | Maximum | Eli Lilly And Company |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Potential future additional development and regulatory milestones (up to) |  | $ 250,000,000 |  |  |  |  |  |
Bristol Myers Squibb Collaboration Agreement |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Sale of stock shares repurchased | 8,300,000 |  |  |  |  |  |  |
Sale of stock repurchased cash consideration | $ 3,000,000 |  |  |  |  |  |  |
Nektar's | Nektar-358 |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Received upfront and milestone payment |  | $ 150,000,000 |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 25.00% |  |  |  |  |  |
Nektar's | Bristol Myers Squibb Collaboration Agreement | Nektar 214 |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Upfront and milestone payments received from license agreements |  |  | $ 1,000,000,000 |  |  |  |  |
Nektar's | Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Milestone One |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Potential future additional payments for development milestones |  |  |  |  |  |  |  | $ 50,000,000

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