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Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |
Capitalized research and development expenses | $ 15,735 | $ 21,979
Net operating loss carryforwards | 18,181 | 12,901
Research and development and other tax credit carryforwards | 12,343 | 12,343
Stock compensation | 4,737 | 4,732
Deferred revenue | 3,635 | 4,100
Other | 930 | 1,483
Total deferred tax assets | 55,561 | 57,538
Valuation allowance | (55,561) | (57,538)
(Decrease) increase in the valuation allowance | $ (2,000) | $ 5,800

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