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Organization and significant accounting policies (Details)
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
reporting_unit
reportable_segment
Apr. 04, 2025
Dec. 31, 2024
USD ($)
Asset Acquisition [Line Items]      
Number of reportable segments | reportable_segment 1    
Number of reporting units | reporting_unit 1    
Cash, cash equivalents, and available-for-sale securities | $ $ 98.4   $ 109.2
PanTHERA CryoSolutions, Inc.      
Asset Acquisition [Line Items]      
Remaining acquired shares percentage   90.00%