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, 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