Product Revenue Net - Schedule Of Each Customer As a Percentage Of Net Product Revenue (Detail) - Net Product Revenue [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Customer 1 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	42.00%
Customer 2 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	14.00%
Customer 3 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	21.00%	25.00%
Customer 4 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%	19.00%