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Income Taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryovers | $ 14,305 | $ 7,236
Stock compensation and other | 1,427 | 697
Change in warrant liability | 45 | 50
Amortization of license | 6,258 | 6,424
Accruals and reserves | 237 | 22
Startup costs | 6 | 8
Tax credits | 1,070 | 178
Total deferred tax assets | 23,348 | 14,615
Less valuation allowance | (23,348) | (14,615)
Deferred tax assets, net of allowance | $ 0 | $ 0

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