Collaborations - Summary of Changes in Accounts Receivable and Contract Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts receivable:
Accounts receivable, Balance at Beginning of Period	$ 2,130	$ 4,620
Accounts receivable, Additions	953	9,765
Accounts receivable, Deductions	(2,130)	(1,017)
Accounts receivable, Balance at End of Period	953	13,368
Contract liabilities:
Deferred revenue, Balance at Beginning of Period	73,931	28,810
Deferred revenue, Deductions	(5,558)	(3,151)
Deferred revenue, Balance at End of Period	$ 68,373	$ 25,659