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Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accounts payable $ 8,244 $ 11,704
Accrued rebates 28,156 28,528
Accrued compensation and benefits 5,603 5,545
Accrued returns 6,947 4,438
Accrued royalties 684 535
Accrued legal 1,564 1,484
Accrued regulatory expenses 1,252 331
Accrued other 959 1,428
Total accounts payable and accrued liabilities $ 53,409 $ 53,993