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Accounts Receivable - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) Distributor
Accounts Receivable [Line Items] |  |
Number of wholesale distributors | Distributor |  | 3
Percentage of gross sales from major wholesale distributors | 73.00% | 72.00%
Allowance for credit losses for accounts receivable | $ | $ 0 | $ 0
Percentage of revenue from major customers collaborations and services | 88.00% | 90.00%
United Therapeutics Corporation |  |
Accounts Receivable [Line Items] |  |
Percentage of collaborations and services net accounts receivables |  | 99.00%
Commercial product sales |  |
Accounts Receivable [Line Items] |  |
Percentage of accounts receivable from major wholesale distributors | 76.00% | 76.00%

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