Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts payable	$ 4,073	$ 4,213
Accrued rebates	35,644	34,247
Accrued compensation and benefits	6,115	5,488
Accrued returns	6,535	5,128
Accrued royalties	1,123	704
Taxes payable	(22)	1,026
Accrued legal	2,113	515
Accrued regulatory expenses	511	397
Accrued other	1,660	1,277
Total accounts payable and accrued liabilities	$ 57,752	$ 52,995