Organization and significant accounting policies - Narrative (Details) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2025 USD ($) reportable_segment reporting_unit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2025
Short-Term Debt [Line Items]
Number of reportable segments | reportable_segment			1
Number of reportable units | reporting_unit			1
Standard warranty, term (in years)			1 year
Unrecognized tax benefits			$ 1,177	$ 1,155	$ 954
Sales and excise tax payable			100	400	400
Advertising expense			$ 400	$ 900	$ 800
Impairment intangible asset, statement of income or comprehensive income, extensible enumeration not disclosed, flag			false	false	false
Tax Attributes Carried Forward
Short-Term Debt [Line Items]
Unrecognized tax benefits			$ 1,200
Minimum
Short-Term Debt [Line Items]
Property, plant and equipment, useful life (in years)			3 years
Maximum
Short-Term Debt [Line Items]
Property, plant and equipment, useful life (in years)			10 years
PanTHERA CryoSolutions, Inc.
Short-Term Debt [Line Items]
Remaining acquired shares percentage						90.00%
PanTHERA CryoSolutions, Inc. | Preferred Stock, Class E
Short-Term Debt [Line Items]
Contingent milestone payment	$ 2,000
Contingent milestone paid			$ 1,900
PanTHERA CryoSolutions, Inc. | Preferred Stock, Class E | PanTHERA Cryosolutions Investment
Short-Term Debt [Line Items]
Equity securities without readily determinable fair value, amount	1,000			$ 1,000
iVexSol, Inc.
Short-Term Debt [Line Items]
Equity securities without readily determinable fair value, amount					$ 4,100
iVexSol, Inc. | Series A-2 Preferred Stock
Short-Term Debt [Line Items]
Equity securities without readily determinable fair value, amount	$ 1,000
iVexSol, Inc. | Series A-1 and A-2, Preferred Stock
Short-Term Debt [Line Items]
Impairment charge		$ 4,100