Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite-lived Intangible Assets, Net Carrying Amount [Roll Forward]
Patent Portfolios and Patent Rights at beginning			$ 9,799
Amortization expenses	$ 531	$ 2,450	1,062	$ 4,872
Patent Portfolios and Patent Rights at ending	$ 8,737		$ 8,737
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			4 years 1 month 20 days