Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Finite-lived Intangible Assets, Net Carrying Amount [Roll Forward]
Patent Portfolios and Patent Rights at beginning			$ 9,799
Amortization expenses	$ (536)	$ (722)	(1,598)	$ (5,594)
Patent Portfolios and Patent Rights at ending	$ 8,201		$ 8,201
Finite-lived Intangible Assets, Weighted Average Amortization Period [Roll Forward]
Patent Portfolios and Patent Rights at beginning			4 years 7 months 17 days
Patent Portfolios and Patent Rights at ending			3 years 10 months 20 days