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Revenue recognition - Net Product Sales (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) segment Distributor	Jun. 30, 2024 Distributor segment	Jun. 30, 2025 USD ($) Distributor segment	Jun. 30, 2024 segment Distributor	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	3	2	2	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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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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