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Taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Significant components of the entity's deferred tax assets |  |
Net operating loss carryforwards | $ 41,003 | $ 45,060
Depreciation, amortization and impairment of property and equipment | 101 | 81
Stock options | $ 2,193 | 1,815
Accrued expenses |  | 179
Research and development credits | $ 4,021 | 4,332
Other | $ 38 | $ 78
Translation adjustment |  |
Deferred tax assets | $ 47,356 | $ 51,545
Valuation allowance for deferred tax assets | $ (47,356) | $ (51,545)
Net deferred taxes |  |

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