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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Accounts receivable from related party	$ 12,090		$ 12,090			$ 4,845
Accrued liabilities to related party	216		216			36,883
Unbilled contract asset	0		0			180,000
Net unbilled contract asset	0		0			125,210
Deferred revenue	0		0			54,790
Europe [Member]
Related Party Transaction [Line Items]
Unbilled contract asset	130,000		130,000
Astellas Agreement [Member]
Related Party Transaction [Line Items]
Drug product revenue from a related party	8,238	$ 0	8,238	$ 0
Astellas Agreement [Member] | Japan [Member]
Related Party Transaction [Line Items]
Deferred revenue	183		183
Astellas Agreement [Member] | Europe [Member]
Related Party Transaction [Line Items]
Unbilled contract asset						130,000
Deferred revenue	2,338		2,338
Astellas [Member] | Europe [Member]
Related Party Transaction [Line Items]
Unbilled contract asset	130,000		130,000
Net unbilled contract asset	0		0			125,200
Deferred revenue	0		0			4,800
Astellas [Member] | Collaborative Arrangement [Member]
Related Party Transaction [Line Items]
Revenue related to collaboration agreements	4,800	134,700	9,500	139,600
Drug product revenue from a related party	8,200		8,200
Expense related to collaboration agreements	200	$ 800	300	$ 1,300
Accounts receivable from related party	12,100		12,100			4,800
Accrued liabilities to related party	$ 200		$ 200			$ 36,900
Astellas [Member] | Astellas Agreement [Member] | Japan [Member]
Related Party Transaction [Line Items]
Accrued liabilities to related party					$ 36,300

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