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Revenue recognition - Net Product Sales (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Distributor segment | Sep. 30, 2024 Distributor segment | Sep. 30, 2025 USD ($) Distributor segment | Sep. 30, 2024 Distributor segment | Dec. 31, 2024 USD ($)
Revenue recognition |  |  |  |  |
Number of operating segments | segment | 1 | 1 | 1 | 1 |
Net product revenue | Customer concentration risk |  |  |  |  |
Revenue recognition |  |  |  |  |
Number of distributors | Distributor | 4 | 2 | 3 | 2 |
Percentage of net product sales | 10.00% | 10.00% | 10.00% | 10.00% |
Product |  |  |  |  |
Revenue recognition |  |  |  |  |
Contract with customer, liability | $ | $ 0 |  | $ 0 |  | $ 0

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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