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Accounts Receivable | 6 Months Ended
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Jun. 30, 2021
Receivables [Abstract] |
Accounts Receivable | 2. Accounts Receivable Accounts receivable, net consists of the following (in thousands):
|  | June 30, 2021 |  |  | December 31, 2020 |
Accounts receivable – commercial |  |  |  |  |  |  |  |
Accounts receivable, gross |  | $ | 8,467 |  |  | $ | 8,090 |
Wholesaler distribution fees and prompt pay discounts |  |  | (1,335 | ) |  |  | (1,205 | )
Reserve for returns |  |  | (2,928 | ) |  |  | (2,667 | )
Total accounts receivable – commercial, net |  |  | 4,204 |  |  |  | 4,218 |
Accounts receivable – collaborations and services |  |  | 2,101 |  |  |  | — |
Total accounts receivable, net |  | $ | 6,305 |  |  | $ | 4,218 |
As of June 30, 2021 and December 31, 2020, the allowance for doubtful accounts was de minimis. The Company had three wholesale distributors representing approximately 88% of commercial accounts receivable as of June 30, 2021 and approximately 82% and 82% of gross sales for the three and six months ended June 30, 2021, respectively.

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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