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Taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Significant components of the entity's deferred tax assets |  |
Net operating loss carryforwards | $ 42,851 | $ 41,003
Depreciation, amortization and impairment of property and equipment | 137 | 101
Stock options | 2,365 | 2,193
Research and development credits | 4,021 | 4,021
Other |  | 38
Deferred tax assets | 49,374 | 47,356
Valuation allowance for deferred tax assets | (49,374) | (47,356)
Net deferred taxes |  |

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