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Income taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 24,223 $ 27,411
Capital loss carryforwards 3,925 7,426
GAAP/tax basis differences 389 (100)
Total deferred tax assets 28,537 34,737
Less: valuation allowance (28,537) (34,737)
Net deferred tax assets $ 0 $ 0