Supplemental Disclosures - Schedules of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Accrued purchases of property and equipment	$ 11,231	$ 7,853
Accrued personnel costs	7,970	13,155
Accrued external research and development expenses	7,792	9,738
Accrued sublicense fees and royalties	6,828	12,160
Accrued income taxes payable	4,005	3,135
Accrued external general and administrative expenses	3,657	2,865
Other accrued expenses and current liabilities	122	176
Accrued expenses and other current liabilities	$ 41,605	$ 49,082