Restructuring, Impairment and Costs of Terminated Program, and Impairment of Goodwill - Summary of Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Impairment of other property, plant and equipment	$ 13,300	$ 57,321	$ 26,455	$ 57,321
Restructuring, impairment and costs of terminated program	16,554	106,045	37,747	107,520
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	1,356	20,408	2,954	20,408
Severance and benefit expense	0	27,750	0	27,750
Impairment of other property, plant and equipment	13,255	57,321	13,255	57,321
Contract termination and other restructuring costs	0	566	878	2,041	$ 11,800
Restructuring, impairment and costs of terminated program	14,611	$ 106,045	17,087	$ 107,520
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Severance and benefit expense	1,943		7,426
Impairment of other property, plant and equipment	0		13,200
Contract termination and other restructuring costs	0		34
Restructuring, impairment and costs of terminated program	$ 1,943		$ 20,660