Segment, Geographic information and revenue disaggregation (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Total revenues	$ 13,373	$ 10,511	$ 35,950	$ 27,990
Number of segments | segment			1
U.S.
Segment Reporting Information [Line Items]
Total revenues	12,300	9,579	$ 32,808	24,818
Germany
Segment Reporting Information [Line Items]
Total revenues	807	802	2,486	2,819
Other countries
Segment Reporting Information [Line Items]
Total revenues	$ 266	$ 130	$ 656	$ 353