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Restructuring, Impairment and Costs of Terminated Program - Summary of Restructuring Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |
Clinical trial expense, other third-party and employee costs for the wind down of the bempegaldesleukin program | $ 5,492 |  |
Severance and benefit expense | 7,885 |  |
Impairment of right-of-use assets and property, plant and equipment | 35,328 | $ 65,761 | $ 0
Loss (gain) on sale or disposal of other property, plant and equipment, net | 1,300 | (3,326) | 0
Contract termination and other restructuring costs | 1,953 |  |
Restructuring, impairment and costs of terminated program | 51,958 | 135,930 | $ 0
2022 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Clinical trial expense, other third-party and employee costs for the wind down of the bempegaldesleukin program | 5,492 | 31,693 |
Severance and benefit expense |  | 30,904 |
Impairment of right-of-use assets and property, plant and equipment | 14,728 | 65,761 |
Loss (gain) on sale or disposal of other property, plant and equipment, net | 0 | (3,326) |
Contract termination and other restructuring costs | 1,919 | 10,898 |
Restructuring, impairment and costs of terminated program | 22,139 | $ 135,930 |
2023 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Clinical trial expense, other third-party and employee costs for the wind down of the bempegaldesleukin program | 0 |  |
Severance and benefit expense | 7,885 |  |
Impairment of right-of-use assets and property, plant and equipment | 20,600 |  |
Loss (gain) on sale or disposal of other property, plant and equipment, net | 1,300 |  |
Contract termination and other restructuring costs | 34 |  |
Restructuring, impairment and costs of terminated program | $ 29,819 |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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