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Income Taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Accruals $ 126 $ 1,109
Stock compensation 1,466 1,352
Net operating losses 20,015 17,190
Basis difference in fixed assets 13 7
Total deferred tax assets 21,620 19,658
Valuation allowance (21,620) (19,658)
Total net deferred tax assets