Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Net-operating loss carryforward	$ 12,971	$ 10,290
Stock based compensation	8,413	8,101
Patent portfolio and other	17,796	17,211
Total Deferred Tax Assets	39,180	35,602
Valuation allowance	(39,180)	(35,602)
Deferred Tax Asset, Net of Allowance