Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts Receivable [Line Items]
Total accounts receivable, net	$ 6,305	$ 4,218
Commercial product sales
Accounts Receivable [Line Items]
Accounts receivable, gross	8,467	8,090
Wholesaler distribution fees and prompt pay discounts	(1,335)	(1,205)
Reserve for returns	(2,928)	(2,667)
Total accounts receivable, net	4,204	$ 4,218
Collaborations and services
Accounts Receivable [Line Items]
Total accounts receivable, net	$ 2,101