Summary of Significant Accounting Policies - Summary of Changes in Reserves for Product Returns and Sales Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Rebates and Chargebacks
Revenue From Contract With Customer Contractual Adjustments [Line Items]
Balance at beginning of year	$ 7,187	$ 6,308
Accruals and adjustments	52,243	34,947
Payments and other reserve reductions	(46,129)	(34,068)
Balance at end of year	13,301	7,187
Patient Discount Programs
Revenue From Contract With Customer Contractual Adjustments [Line Items]
Balance at beginning of year	1,292	845
Accruals and adjustments	15,629	12,422
Payments and other reserve reductions	(13,971)	(11,975)
Balance at end of year	2,950	1,292
Returns
Revenue From Contract With Customer Contractual Adjustments [Line Items]
Balance at beginning of year	458	370
Accruals and adjustments	4,163	2,657
Payments and other reserve reductions	(3,992)	(2,569)
Balance at end of year	629	458
Wholesaler Distribution Fees
Revenue From Contract With Customer Contractual Adjustments [Line Items]
Balance at beginning of year	2,498	1,683
Accruals and adjustments	15,683	11,619
Payments and other reserve reductions	(14,498)	(10,804)
Balance at end of year	3,683	2,498
Prompt Payment Discounts
Revenue From Contract With Customer Contractual Adjustments [Line Items]
Balance at beginning of year	436	320
Accruals and adjustments	3,423	2,494
Payments and other reserve reductions	(3,222)	(2,378)
Balance at end of year	$ 637	$ 436