v3.26.1
Income taxes (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Operating Loss Carryforwards [Line Items]      
Income tax (expense) provision $ 1,000 $ (5,000)  
Federal      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards     $ 483,700,000
Tax credit carryforwards     10,300,000
State      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards     9,700,000
Tax credit carryforwards     $ 1,900,000