Organization and significant accounting policies - Concentrations Risk by Geographic Locations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Long-lived assets	$ 40,330	$ 48,266
United States
Long-lived assets	33,378	42,829
Netherlands
Long-lived assets	$ 6,952	$ 5,437
Revenue Benchmark | Product Concentration Risk | CryoStor
Revenue	39.00%	36.00%	33.00%
Revenue Benchmark | Product Concentration Risk | 780XLE Freezer
Revenue	19.00%	22.00%	22.00%
Revenue Benchmark | Geographic Concentration Risk
Revenue	100.00%	100.00%	100.00%
Revenue Benchmark | Geographic Concentration Risk | United States
Revenue	80.00%	79.00%	85.00%
Revenue Benchmark | Geographic Concentration Risk | Europe, Middle East, Africa (EMEA)
Revenue	16.00%	16.00%	11.00%
Revenue Benchmark | Geographic Concentration Risk | Other
Revenue	4.00%	5.00%	4.00%