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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