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Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts receivable, gross $ 7,449 $ 8,090
Wholesaler distribution fees and prompt pay discounts (1,471) (1,205)
Reserve for returns (2,405) (2,667)
Accounts receivable, net $ 3,573 $ 4,218