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Income taxes - Components of the company's current and deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Operating loss carryforwards $ 81,492 $ 66,555
Research credit carryforwards 3,362  
Operating lease liability 2,641 3,680
Share-based compensation 21,035 15,577
Depreciation & amortization 1,508  
Accrued expenses and other 1,952 2,742
Total deferred tax assets 111,990 88,554
Deferred tax liabilities:    
Operating lease right-of-use asset (2,201) (3,389)
Total deferred tax liabilities (2,201) (3,389)
Valuation allowance (99,672) (80,274)
Net deferred tax assets $ 10,117 $ 4,891