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License and Collaboration Agreements - Additional Information (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2021 | Apr. 03, 2018 | Jul. 23, 2017 | Apr. 30, 2018 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  |  |  |  |  | $ 0 |  |  |
Revenue, excluding assessed tax |  |  |  |  | $ 24,144,000 | $ 23,625,000 |  | $ 66,237,000 | $ 70,032,000 |
SFJ |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Committed funding (up to) | $ 150,000,000 |  |  |  |  |  |  |  |  |
Success payments (up to) | $ 637,500,000 |  |  |  |  |  |  |  |  |
Non-cash royalty revenue related to the sales of future royalties |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue, excluding assessed tax |  |  |  |  | 18,167,000 | 18,342,000 |  | 50,860,000 | 52,167,000 |
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 |  |  |  |  |  |
Bristol Myers Squibb Company | Nektar 214 | Research and Development Expense |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Reimbursement of expenses |  |  |  |  |  | $ 8,300,000 | $ 24,900,000 |  | $ 16,700,000 |
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 | Bristol Myers Squibb Company | Nektar 214 |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs |  | 35.00% |  |  |  |  |  |  |  |
Bristol Myers Squibb Collaboration Agreement | Bristol Myers Squibb Company | Nektar 214 | Opdivo |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs |  | 67.50% |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs |  | 65.00% |  |  |  |  |  |  |  |
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
Nektar's | Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Opdivo |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs |  | 32.50% |  |  |  |  |  |  |  |

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