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Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts Receivable [Line Items] |  |
Total accounts receivable, net | $ 9,445 | $ 4,218
Allowance for doubtful accounts | (800) |
Commercial product sales |  |
Accounts Receivable [Line Items] |  |
Accounts receivable, gross | 7,297 | 8,090
Wholesaler distribution fees and prompt pay discounts | (1,680) | (1,205)
Reserve for returns | (2,964) | (2,667)
Total accounts receivable, net | 2,653 | $ 4,218
Collaborations and services |  |
Accounts Receivable [Line Items] |  |
Accounts receivable, gross | 7,559 |
Total accounts receivable, net | 6,792 |
Allowance for doubtful accounts | $ (767) |

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