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Revenue, Credit Concentrations and Geographic Information - Total Net Product Revenue Concentrations Attributed to Largest Customers (Detail) - Customer Concentration Risk - Net Product Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Customer A, B, & C
Concentration Risk [Line Items]
Concentration risk, percentage	47.00%	41.00%	41.00%	41.00%
Customer A
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	16.00%	17.00%	15.00%
Customer B
Concentration Risk [Line Items]
Concentration risk, percentage	16.00%	14.00%	14.00%	14.00%
Customer C
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	11.00%	10.00%	12.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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