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Accounts Receivable - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) Distributor
Accounts Receivable [Line Items] |  |
Number of wholesale distributors | Distributor |  | 3
Percentage of gross sales from major wholesale distributors | 81.00% | 82.00%
Allowance for accounts receivable | $ 0.8 | $ 0.8
Percentage of sales from major customers collaborations and services | 99.00% | 95.00%
United Therapeutics Corporation |  |
Accounts Receivable [Line Items] |  |
Percentage of collaborations and services accounts receivables |  | 79.00%
Vertice Pharma LLC |  |
Accounts Receivable [Line Items] |  |
Allowance for accounts receivable | $ 1.5 | $ 1.5
Commercial product sales |  |
Accounts Receivable [Line Items] |  |
Percentage of accounts receivable from major wholesale distributors | 87.00% | 87.00%

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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