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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 51,758 | $ 46,056
Charitable contribution carryforwards | 552 | 454
Research and experimentation credits | 1,440 | 1,172
Capitalized intangibles | 781 | 746
Stock based compensation | 193 | 162
Depreciation and amortization | 6 | 2
Vacation accrual | 35 | 28
Other | 14 |
Total deferred tax assets | 54,779 | 48,620
Valuation allowance | (54,779) | (48,620)
Net deferred tax assets | $ 0 | $ 0

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