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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, 2024 | Mar. 31, 2023
Chargebacks, Discounts, and Fees [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | $ 5,674 | $ 164
Provision related to sales in the current year | 9,575 | 1,466
Adjustments related to prior period sales | 146 |
Credits and payments made | (9,724) | (184)
Ending balance | 5,671 | 1,446
Government and Other Rebates [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 8,898 | 1,936
Provision related to sales in the current year | 13,125 | 2,566
Adjustments related to prior period sales | (19) | (2)
Credits and payments made | (9,906) | (1,639)
Ending balance | 12,098 | 2,861
Returns [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 2,053 | 251
Provision related to sales in the current year | 1,355 | 651
Adjustments related to prior period sales | (96) | (249)
Credits and payments made | (1,859) |
Ending balance | 1,453 | 653
Product Revenue Allowance and Reserves [Member] |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Beginning Balance | 16,625 | 2,351
Provision related to sales in the current year | 24,055 | 4,683
Adjustments related to prior period sales | 31 | (251)
Credits and payments made | (21,489) | (1,823)
Ending balance | $ 19,222 | $ 4,960

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