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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred tax assets |  |
Net operating loss carryforwards | $ 85,734 | $ 80,136
Tax credit carryforwards | 14,576 | 12,073
Capitalized research and development | 16,927 | 8,094
Capitalized licenses | 4,041 |
Capitalized legal expenses | 918 | 964
Lease liability | 90 | 257
Other differences | 2,587 | 2,365
Total gross deferred tax assets | 124,873 | 103,889
Less valuation allowance | (124,774) | (103,630)
Net deferred tax assets | 99 | 259
Deferred tax liabilities |  |
ROU asset | (99) | (259)
Net deferred taxes | 0 | 0
Deferred tax assets research and development | 16,900 | 8,100
Increase in valuation allowance | $ 21,100 | $ 14,600

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