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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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Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Chargebacks, Discounts, and Fees [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Beginning Balance | $ 5,930 | $ 5,671 | $ 5,674 | $ 3,638 | $ 1,446 | $ 164
Provision related to sales in the current year | 11,455 | 10,025 | 9,575 | 4,698 | 3,944 | 1,466
Adjustments related to prior period sales | 2,332 | (131) | 146 | 39 | (84) |
Credits and payments made | (12,078) | (9,635) | (9,724) | (4,960) | (1,668) | (184)
Ending balance | 7,639 | 5,930 | 5,671 | 3,415 | 3,638 | 1,446
Government and Other Rebates [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Beginning Balance | 15,589 | 12,098 | 8,898 | 5,059 | 2,861 | 1,936
Provision related to sales in the current year | 25,364 | 17,777 | 13,125 | 7,169 | 5,114 | 2,566
Adjustments related to prior period sales | 420 | 354 | (19) | (964) | 30 | (2)
Credits and payments made | (17,695) | (14,640) | (9,906) | (5,778) | (2,946) | (1,639)
Ending balance | 23,678 | 15,589 | 12,098 | 5,486 | 5,059 | 2,861
Returns [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Beginning Balance | 1,183 | 1,453 | 2,053 | 1,684 | 653 | 251
Provision related to sales in the current year | 1,380 | 1,039 | 1,355 | 1,384 | 1,588 | 651
Adjustments related to prior period sales |  | (983) | (96) | (1,685) | (416) | (249)
Credits and payments made | (979) | (326) | (1,859) |  | (141) |
Ending balance | 1,584 | 1,183 | 1,453 | 1,383 | 1,684 | 653
Product Revenue Allowance and Reserves [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Beginning Balance | 22,702 | 19,222 | 16,625 | 10,381 | 4,960 | 2,351
Provision related to sales in the current year | 38,199 | 28,841 | 24,055 | 13,251 | 10,646 | 4,683
Adjustments related to prior period sales | 2,752 | (760) | 31 | (2,610) | (470) | (251)
Credits and payments made | (30,752) | (24,601) | (21,489) | (10,738) | (4,755) | (1,823)
Ending balance | $ 32,901 | $ 22,702 | $ 19,222 | $ 10,284 | $ 10,381 | $ 4,960

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