Summary of Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]
Manufacturing-related deposits and prepaids	$ 84,275	$ 134,430
Collaboration receivable	29,084	34,184
Prepaid clinical and pre-clinical expenses	12,497	16,224
Prepaid maintenance services	7,197	6,411
Prepaid research expenses	3,895	5,854
Leasehold improvement receivable	2,687	3,059
Prepaid income tax	1,599	4,939
Prepaid insurance	1,029	4,158
Other	5,678	4,065
Total other current assets	$ 147,941	$ 213,324

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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