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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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