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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