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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Noncurrent deferred tax assets: |  |
Net operating loss carryforwards | $ 46,056 | $ 42,135
Charitable contribution carryforwards | 454 | 410
Research and experimentation credits | 1,172 | 991
Capitalized intangibles | 746 | 741
Stock based compensation | 162 | 158
Depreciation and amortization | 2 | 2
Vacation accrual | 28 | 25
Total noncurrent deferred tax assets | 48,620 | 44,462
Valuation allowance | (48,620) | (44,462)
Net noncurrent deferred tax assets | $ 0 | $ 0

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