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Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Accounts receivable, gross $ 2,019 $ 2,842
Wholesaler distribution fees and prompt pay discounts (340) (53)
Reserve for returns (129)  
Accounts receivable, net $ 1,550 $ 2,789