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Income Taxes, Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets [Abstract] |  |
Reserves and accruals | $ 62 | $ 45
Research and development credits and other credits | 1,730 | 1,635
Net operating loss carry forward | 27,907 | 25,733
Stock based compensation | 8,402 | 8,857
Other | 11 | 26
Total deferred tax assets | 38,112 | 36,296
Valuation allowance | (38,112) | (36,296)
Deferred tax assets after valuation allowance | 0 | 0
Total deferred tax liability | 0 | 0
Net deferred tax assets (liabilities) | $ 0 | $ 0

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