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License and Collaboration Agreements - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2018 | Aug. 23, 2017 | Apr. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2018 | Dec. 31, 2020 | Jan. 09, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized in period related to performance in prior periods |  |  |  |  | $ 19,400,000 | $ 22,700,000 | $ 58,700,000 | $ 109,400,000 |  |  |
Potential future additional development and regulatory milestones (up to) |  |  |  |  | 1,700,000,000 |  | 1,700,000,000 |  |  |  |
Accounts receivable |  |  |  |  | 28,994,000 |  | 28,994,000 |  |  | $ 38,889,000 |
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 Collaboration Agreement |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales milestone, revenue |  |  |  |  |  |  |  | 50,000,000 |  |  |
Bristol Myers Squibb Collaboration Agreement | Bristol-Myers Squibb Company | Purchase Agreement |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total consideration received under agreements |  |  |  |  |  |  |  |  | $ 1,850,000,000 |  |
Estimated fair value of shares |  |  |  |  |  |  |  |  | 790,200,000 |  |
Remaining amount allocated to transaction price |  |  |  |  |  |  |  |  | $ 1,059,800,000 |  |
Nektar-358 | Nektar's |  |  |  |  |  |  |  |  |  |  |
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-358 | Eli Lilly and Company | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential future additional development and regulatory milestones (up to) |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Nektar-358 | Eli Lilly and Company | Nektar's |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of regulatory milestones payments will be reduced under certain conditions |  | 50.00% |  |  |  |  |  |  |  |  |
Percentage of regulatory milestones payments will be reduced if conditions occur |  | 75.00% |  |  |  |  |  |  |  |  |
Nektar-358 | Eli Lilly and Company | Nektar's | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of funding phase 3 development costs on an indication by indication basis borne |  | 25.00% |  |  |  |  |  |  |  |  |
Nektar-358 | Eli Lilly and Company | Nektar's | Minimum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of funding phase 3 development costs on an indication by indication basis borne |  | 0.00% |  |  |  |  |  |  |  |  |
Nektar-358 | Eli Lilly |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 75.00% |  |  |  |  |  |  |  |  |
Other | Nektar's |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential future additional payments for development milestones (up to) |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |  |
Nektar 214 | Bristol-Myers Squibb Company | Research and Development Expense |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reimbursement of expenses |  |  |  |  | 24,300,000 | $ 29,200,000 | 76,500,000 | $ 93,800,000 |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Nektar's |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Global commercialization profits and losses sharing percentage | 65.00% |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs | 65.00% |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments received from license agreements |  |  | 1,000,000,000 |  |  |  |  |  |  |  |
Maximum total additional cash payments receivable upon achievement of certain development and regulatory milestones |  |  |  |  |  |  | 1,455,000,000 |  |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Nektar's | Milestone One |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential future additional payments for development milestones (up to) |  |  |  |  |  |  |  |  |  |  | $ 25,000,000
Potential development milestones excluded from transaction price (up to) |  |  |  |  | $ 1,800,000,000 |  | $ 1,800,000,000 |  |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Nektar's | Maximum |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Eligible additional cash payments receivable upon achievement of certain sales milestones |  |  | $ 350,000,000 |  |  |  |  |  |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Nektar's | Opdivo |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 32.50% |  |  |  |  |  |  |  |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Bristol-Myers Squibb Company |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Global commercialization profits and losses sharing percentage | 35.00% |  |  |  |  |  |  |  |  |  |
Percentage of sharing production costs | 35.00% |  |  |  |  |  |  |  |  |  |
Nektar 214 | Bristol Myers Squibb Collaboration Agreement | Bristol-Myers Squibb Company | Opdivo |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 67.50% |  |  |  |  |  |  |  |  |  |
Nektar 358 License | Eli Lilly and Company |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  | 125,900,000 |  |  |  |  |  |  |
Nektar 358 License | Phase 1 Clinical Development | Eli Lilly and Company |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  | 17,600,000 |  |  |  |  |  |  |
Nektar 358 License | Drug Product Development | Eli Lilly and Company |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  | $ 6,500,000 |  |  |  |  |  |  |

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