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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Deferred tax assets |  |
Net operating loss carryforwards | $ 55,283 | $ 48,107
Tax credit carryforwards | 8,030 | 7,174
Capitalized research and development | 922 | 1,394
Capitalized legal expenses | 1,073 | 1,132
Lease liability | 639 |
Other differences | 1,453 | 1,370
Total deferred tax assets | 67,400 | 59,177
Deferred tax liabilities |  |
ROU asset | (639) |
Valuation allowance | (66,761) | (59,177)
Increase in valuation allowance | $ 7,600 | $ (7,800)
Federal income tax (benefit) at statutory rate | 21.00% | 21.00%

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