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Product Revenues, Accounts Receivable, and Reserves for Product Sales - Schedule of Customer Accounted for 10% of More of Gross Product Revenues and Accounts Receivable (Detail) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Gross Product Revenues [Member] | Customer A [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 13.00% | 12.00% | 12.00% | 13.00%
Gross Product Revenues [Member] | Customer C [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 21.00% | 17.00% | 19.00% | 18.00%
Gross Product Revenues [Member] | Customer D [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk | 58.00% | 61.00% | 59.00% | 59.00%
Product Sales Receivable [Member] | Customer A [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 4.00% | 3.00%
Product Sales Receivable [Member] | Customer C [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 21.00% | 24.00%
Product Sales Receivable [Member] | Customer D [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk |  |  | 67.00% | 61.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-20 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 + Details
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