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Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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

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