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Basis of Presentation and Significant Accounting Policies - Summary of Percentage of the Company's Total Net Product Revenue (Detail) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	84.00%	74.60%	78.20%	71.50%
Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	5.70%	9.40%	7.90%	10.00%
Customer [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	89.70%	84.00%	86.10%	81.50%

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- Definition

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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