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Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Accounts Receivable, gross $ 8,090 $ 6,925
Wholesaler distribution fees and prompt pay discounts (1,205) (1,767)
Reserve for returns (2,667) (1,645)
Accounts receivable, net $ 4,218 $ 3,513