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License and Collaboration Agreements - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Feb. 13, 2018 | Aug. 23, 2017 USD ($) | Apr. 30, 2018 USD ($) shares | Jan. 31, 2018 USD ($) | Nov. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Sep. 30, 2016 | Mar. 31, 2016 | Oct. 31, 2010 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Jan. 09, 2020 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 129,600,000 | $ 77,500,000 | $ 95,300,000 |  |  |
Potential future additional payments for development milestones |  |  |  |  |  |  |  |  |  |  | $ 1,700,000,000 |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | 38,889,000 |  |  |  | $ 36,802,000 |  |  |  | 38,889,000 | 36,802,000 |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  |  | 6,516,000 |  |  |  | 768,000 |  |  |  | 6,516,000 | 768,000 |  |  |  |
Development milestones received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,516,000 |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 2,555,000 |  |  |  | 8,071,000 |  |  |  | 2,555,000 | 8,071,000 |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  |  |  | 23,462,000 | $ 30,033,000 | $ 48,847,000 | $ 50,573,000 | 33,862,000 | $ 29,218,000 | $ 23,315,000 | $ 28,222,000 | $ 152,915,000 | 114,617,000 | 1,193,323,000 |  |  |
Percentage of net sales to fund external costs incurred, due to reduction of 2 percentage points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.02 |  |  |  |  |
BMS Collaboration Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales milestone revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |  |  |
NKTR-358 | Nektar's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Regulatory milestones payment, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | A portion of the development milestones may be reduced by 50% under certain conditions, related to the final formulation of the approved product and the timing of prior approval (if any) of competitive products with a similar mechanism of action, which could reduce these milestone payments by 75% if both conditions occur. |  |  |  |  |
Bristol Myers Squibb Collaboration Agreement | Nektar 214 | 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 |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum total additional cash payments receivable upon achievement of certain development and regulatory milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,455,000,000 |  |  |  |  |
Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Nektar's | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible additional cash payments receivable upon achievement of certain sales milestones |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Nektar's | Opdivo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 32.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nektar-358 | Nektar's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nektar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of upfront payment, market access milestones, royalties and sales milestones |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly | Nektar-358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing in Phase 2 development costs |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb | Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  | 8,284,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock consideration received |  |  | $ 850,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb | Nektar 214 | Research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement of expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,200,000 | 105,400,000 | 62,500,000 |  |  |
Bristol-Myers Squibb | BMS Collaboration Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | 38,700,000 |  |  |  | $ 24,000,000.0 |  |  |  | 38,700,000 | $ 24,000,000.0 |  |  |  |
Company share of development costs, annual cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000.0 |  |  |  |  |
Company share of development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000,000.0 |  |  |  |  |
Development costs exceeded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000.0 |  |  |  |  |
Reimbursement recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000.0 |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  |  |  |  |  |  | 4,000,000.0 |  |  |  |  |
Bristol-Myers Squibb | Clinical Trial Agreement | Nektar 214 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of out-of-pocket costs to be reimbursed by partner |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb | Bristol Myers Squibb Collaboration Agreement | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  | 1,059,800,000 |  |  |
Potential future development, regulatory and sales milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  |
Bristol-Myers Squibb | Bristol Myers Squibb Collaboration Agreement | Nektar 214 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bristol-Myers Squibb | Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Opdivo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sharing development costs | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baxalta Incorporated / Takeda | Hemophilia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received under right to sublicense agreement |  |  |  |  | $ 12,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baxalta Incorporated / Takeda | Hemophilia | Annual Sales Level Milestone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |
Baxalta Incorporated / Takeda | Hemophilia | European Union |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Nektar-358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  | 125,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  | $ 125,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Nektar-358 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future additional development and regulatory milestones |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Nektar-358 | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Nektar-358 | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Nektar-358 | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Phase 1 Clinical Development | Nektar-358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  | 17,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eli Lilly and Company | Drug Product Development | Nektar-358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of transaction price allocated to performance obligation |  |  |  |  |  | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amgen, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Astra Zeneca Ab | MOVANTIK and MOVENTIG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net sales to fund external costs incurred |  |  |  |  |  |  |  |  |  |  | 0.33 |  |  |  |  |  |  |  | 0.33 |  |  |  |  |
Amount of net sales to fund external costs incurred cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000.0 |  |  |  |  |
Astra Zeneca Ab | MOVANTIK and MOVENTIG | Upfront Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received upfront and milestone payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,600,000 | $ 385,000,000.0 |
Astra Zeneca Ab | AstraZeneca-Kirin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |
Percentage of upfront payment, market access milestone payments, royalties and sales milestone payments from sublicense agreement retained by our collaboration partner |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future additional payments for development milestones |  |  |  |  |  |  |  |  |  |  | 40,000,000.0 |  |  |  |  |  |  |  | 40,000,000.0 |  |  |  |  |
Terminated Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |
Milestone One | Bristol Myers Squibb Collaboration Agreement | Nektar 214 | Nektar's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future additional payments for development milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0

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