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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

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