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Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables [Abstract] |  |
Accounts Receivable, gross | $ 6,925 | $ 5,198
Wholesaler distribution fees and prompt pay discounts | (1,767) | (868)
Reserve for returns | (1,645) | (313)
Accounts receivable, net | $ 3,513 | $ 4,017

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