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Summary of significant accounting policies - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 8,054	$ 7,262	$ 16,056	$ 14,467
United States
Disaggregation of Revenue [Line Items]
Total revenue	3,014	2,363	5,485	4,389
Switzerland
Disaggregation of Revenue [Line Items]
Total revenue	1,365	1,637	2,732	3,117
Japan
Disaggregation of Revenue [Line Items]
Total revenue	1,015	296	1,432	1,421
Germany
Disaggregation of Revenue [Line Items]
Total revenue	892	2,005	1,781	3,314
South Korea
Disaggregation of Revenue [Line Items]
Total revenue	693	109	1,971	161
All other countries
Disaggregation of Revenue [Line Items]
Total revenue	1,075	852	2,655	2,065
Product and service revenue — recurring
Disaggregation of Revenue [Line Items]
Total revenue	5,049	4,419	10,117	8,388
Product and service revenue — non-recurring
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,005	$ 2,843	$ 5,939	$ 6,079

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