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Summary of significant accounting policies - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,205	$ 5,611
United States
Disaggregation of Revenue [Line Items]
Total revenue	2,026	2,149
Switzerland
Disaggregation of Revenue [Line Items]
Total revenue	1,480	972
Germany
Disaggregation of Revenue [Line Items]
Total revenue	1,309	464
Japan
Disaggregation of Revenue [Line Items]
Total revenue	1,124	800
All other countries
Disaggregation of Revenue [Line Items]
Total revenue	1,266	1,226
Product and Service Revenue | Product and service revenue — recurring
Disaggregation of Revenue [Line Items]
Total revenue	3,969	3,743
Product and Service Revenue | Product and service revenue — non-recurring
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,236	$ 1,868

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