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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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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Chargebacks, Discounts, and Fees [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Beginning Balance | $ 9,221 | $ 11,589 | $ 5,671 | $ 5,674
Provision related to sales in the current period | 12,138 | 10,277 | 10,025 | 9,575
Adjustments related to prior period sales | (66) | 439 | (131) | 146
Credits and payments made | (10,833) | (13,084) | (9,635) | (9,724)
Ending balance | 10,460 | 9,221 | 5,930 | 5,671
Government and Other Rebates [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Beginning Balance | 27,192 | 31,533 | 12,098 | 8,898
Provision related to sales in the current period | 30,823 | 24,139 | 17,777 | 13,125
Adjustments related to prior period sales | 185 | (13) | 354 | (19)
Credits and payments made | (27,623) | (28,467) | (14,640) | (9,906)
Ending balance | 30,577 | 27,192 | 15,589 | 12,098
Returns [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Beginning Balance | 2,491 | 2,023 | 1,453 | 2,053
Provision related to sales in the current period | 1,083 | 976 | 1,039 | 1,355
Adjustments related to prior period sales | 852 | (382) | (983) | (96)
Credits and payments made | (941) | (126) | (326) | (1,859)
Ending balance | 3,485 | 2,491 | 1,183 | 1,453
Product Revenue Allowance and Reserves [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Beginning Balance | 38,904 | 45,145 | 19,222 | 16,625
Provision related to sales in the current period | 44,044 | 35,392 | 28,841 | 24,055
Adjustments related to prior period sales | 971 | 44 | (760) | 31
Credits and payments made | (39,397) | (41,677) | (24,601) | (21,489)
Ending balance | $ 44,522 | $ 38,904 | $ 22,702 | $ 19,222

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