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Restructuring, Impairment and Costs of Terminated Program, and Impairment of Goodwill - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Apr. 30, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment expense for facilities |  |  | $ 13,255 | $ 11,500 |  | $ 52,201 | $ 24,755 | $ 52,200 |  |
Impairment of other property, plant and equipment |  |  |  | 1,700 |  | 5,120 | 1,700 |  |  |
Impairment of goodwill |  |  | 0 | $ 76,500 |  | 0 | 76,501 | 0 |  |
Impairment of other property, plant and equipment |  |  | 13,300 |  |  | 57,321 | 26,455 | 57,321 |  |
Nektar 214 | Research and Development Expense | Bristol Myers Squibb Company |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Reimbursement of expenses |  |  |  |  |  | 7,600 |  | 24,900 |  |
Third St. Facility |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment expense for facilities |  |  | 6,200 |  | $ 12,000 |  |  |  |  |
Mission Bay Facility |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment expense for facilities |  |  | 7,100 |  |  |  |  |  |  |
2022 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Contract termination and other restructuring costs |  |  | 0 |  |  | 566 | 878 | 2,041 |  | $ 11,800
Impairment of other property, plant and equipment |  |  | 13,255 |  |  | $ 57,321 | 13,255 | $ 57,321 |  |
2023 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Contract termination and other restructuring costs |  |  | 0 |  |  |  | 34 |  |  |
Impairment of other property, plant and equipment |  |  | $ 0 |  |  |  | $ 13,200 |  |  |
Measurement Input, Market Participant Subtenant Borrowing Rate |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease, measurement input |  |  |  | 7.90% |  | 6.40% |  |  |  |
Sublease income, measurement input |  |  | 8.50% |  |  |  |  |  |  |
Employee Severance |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring, impairment, and costs of terminated program |  |  | $ 1,943 | $ 5,483 |  |  |  |  | $ 30,900 |
Payments during the period | $ 3,300 |  | 6,624 | 3,299 |  |  |  |  |  |
Employee Severance | 2022 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce termination, percentage |  | 70.00% |  |  |  |  |  |  |  |
Restructuring, impairment, and costs of terminated program |  |  | 0 | 0 |  |  |  |  |  |
Payments during the period |  |  | 0 | 3,299 |  |  |  |  |  |
Employee Severance | 2023 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce termination, percentage |  |  |  |  |  |  | 60.00% |  |  |
Restructuring, impairment, and costs of terminated program |  |  | 1,943 | 5,483 |  |  |  |  |  |
Payments during the period |  |  | $ 6,624 | $ 0 |  |  |  |  |  |

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