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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 38,566 | $ 51,758
Charitable contribution carryforwards | 455 | 552
Research and experimentation credits | 1,682 | 1,440
Capitalized intangibles | 608 | 781
Stock based compensation | 148 | 193
Depreciation and amortization | 1 | 6
Accrued compensation | 168 | 35
Other |  | 14
Total deferred tax assets | 41,628 | 54,779
Valuation allowance | (41,628) | (54,779)
Net deferred tax assets | $ 0 | $ 0

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