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Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Receivable [Line Items] |  |
Allowance for credit losses | $ (800) |
Accounts receivable – other | 255 |
Total accounts receivable, net | 4,994 | $ 4,218
Commercial product sales |  |
Accounts Receivable [Line Items] |  |
Accounts receivable, gross | 7,939 | 8,090
Wholesaler distribution fees and prompt pay discounts | (1,696) | (1,205)
Reserve for returns | (2,797) | (2,667)
Total accounts receivable, net | 3,446 | 4,218
Collaborations and services |  |
Accounts Receivable [Line Items] |  |
Accounts receivable, gross | 2,060 |
Allowance for credit losses | (767) |
Total accounts receivable, net | $ 1,293 | $ 4,218

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