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Income Tax - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Deferred tax assets: |  |  |
Depreciation of property and equipment, net | $ 131 | $ 98 |
Research and experimental capitalization | 30,429 | 22,476 |
Share-based compensation | 3,422 | 1,787 |
Accrued expenses | 707 | 1,800 |
Government grants | 467 | 189 |
Deferred revenue | 4,354 | 3,378 |
Qualified donation | 22,992 | 12,947 |
Lease liability | 2,967 | 3,738 |
Net operating loss carry forwards | 295,313 | 241,397 |
Less: valuation allowance | (357,956) | (284,072) | $ (189,684)
Total Deferred tax assets | 2,826 | 3,738 |
Deferred tax liabilities: |  |  |
Right-of-use assets | (2,826) | (3,738) |
Deferred tax assets, net | $ 0 | $ 0 |

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