Product Revenues, Accounts Receivable, and Reserves for Product Sales - Summary of Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands	3 Months Ended
	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