Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable [Line Items]
Total accounts receivable, net	$ 9,445	$ 4,218
Allowance for doubtful accounts	(800)
Commercial product sales
Accounts Receivable [Line Items]
Accounts receivable, gross	7,297	8,090
Wholesaler distribution fees and prompt pay discounts	(1,680)	(1,205)
Reserve for returns	(2,964)	(2,667)
Total accounts receivable, net	2,653	$ 4,218
Collaborations and services
Accounts Receivable [Line Items]
Accounts receivable, gross	7,559
Total accounts receivable, net	6,792
Allowance for doubtful accounts	$ (767)