Accounts Payable and Accrued Liabilities - Summary of Components (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accounts payable	$ 4,213	$ 11,704
Accrued rebates	34,247	28,528
Accrued compensation and benefits	5,488	5,545
Accrued returns	5,128	4,438
Accrued royalties	704	535
Taxes payable	1,026	0
Accrued regulatory fees	397	331
Accrued legal	515	1,484
Accrued other	1,277	1,428
Total accounts payable and accrued expenses	$ 52,995	$ 53,993