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Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts receivable, gross $ 7,424 $ 6,925
Wholesaler distribution fees and prompt pay discounts (1,231) (1,767)
Reserve for returns (2,058) (1,645)
Accounts receivable, net $ 4,135 $ 3,513