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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 40,742 | $ 38,566
Charitable contribution carryforwards | 433 | 455
Research and experimentation credits | 1,796 | 1,682
Capitalized intangibles | 409 | 608
Stock-based compensation | 127 | 148
Depreciation and amortization | 1 | 1
Accrued compensation | 20 | 168
Other | 1 |
Total deferred tax assets | 43,529 | 41,628
Valuation allowance | (43,529) | (41,628)
Net deferred tax assets | $ 0 | $ 0

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