Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts payable	$ 5,308	$ 4,213
Accrued rebates	33,703	34,247
Accrued compensation and benefits	4,796	5,488
Accrued returns	5,553	5,128
Accrued royalties	783	704
Taxes payable	1,026	1,026
Accrued legal	1,805	515
Accrued regulatory expenses	558	397
Accrued other	1,052	1,277
Total accounts payable and accrued liabilities	$ 54,584	$ 52,995