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Product Revenues, Accounts Receivable, and Reserves for Product Sales - Schedule of Customer Accounted for 10% of More of Gross Product Revenues and Accounts Receivable (Detail) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Gross Product Revenues [Member] | Customer A [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 12.00% | 24.00% | 13.00% | 29.00%
Gross Product Revenues [Member] | Customer C [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 17.00% | 16.00% | 18.00% | 14.00%
Gross Product Revenues [Member] | Customer D [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 61.00% | 56.00% | 59.00% | 52.00%
Product Sales Accounts Receivable [Member] | Customer A [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 3.00% | 7.00%
Product Sales Accounts Receivable [Member] | Customer C [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 24.00% | 19.00%
Product Sales Accounts Receivable [Member] | Customer D [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 61.00% | 68.00%

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