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