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Product Revenues, Accounts Receivable, and Reserves for Product Sales - Summary of Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Chargebacks, Discounts, and Fees [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | $ 11,589 | $ 5,674
Provision related to sales in the current year | 10,277 | 9,575
Adjustments related to prior period sales | 439 | 146
Credits and payments made | (13,084) | (9,724)
Ending balance | 9,221 | 5,671
Government and Other Rebates [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 31,533 | 8,898
Provision related to sales in the current year | 24,139 | 13,125
Adjustments related to prior period sales | (13) | (19)
Credits and payments made | (28,467) | (9,906)
Ending balance | 27,192 | 12,098
Returns [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 2,023 | 2,053
Provision related to sales in the current year | 976 | 1,355
Adjustments related to prior period sales | (382) | (96)
Credits and payments made | (126) | (1,859)
Ending balance | 2,491 | 1,453
Product Revenue Allowance and Reserves [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 45,145 | 16,625
Provision related to sales in the current year | 35,392 | 24,055
Adjustments related to prior period sales | 44 | 31
Credits and payments made | (41,677) | (21,489)
Ending balance | $ 38,904 | $ 19,222

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