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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net-operating loss carryforward $ 12,163 $ 9,608
Stock based compensation 5,444 5,368
Patent portfolio and other 9,183 11,244
Total Deferred Tax assets 26,790 26,220
Valuation allowance (26,790) (26,220)
Deferred Tax Asset, Net of Allowance