Segment And Geographic Information Schedule of Operating Income (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Total revenue	$ 63,954	$ 91,322	$ 129,486	$ 158,577
Total operating expenses	91,560	103,822	189,583	217,385
Operating income (loss)	(27,606)	(5,674)	(60,097)	(45,569)
Loss before taxes	(31,577)	(12,500)	(67,232)	(58,808)
Operating Segments | Product Licensing Segment
Segment Reporting Information [Line Items]
Total revenue	51,161	46,362	104,377	74,063
Total operating expenses	42,142	42,619	86,036	85,801
Operating income (loss)	9,019		18,341
Loss before taxes		3,743		(11,738)
Operating Segments | Semiconductor and IP Licensing Segment
Segment Reporting Information [Line Items]
Total revenue	12,793	44,960	25,109	84,514
Total operating expenses	18,942	21,374	38,369	44,137
Operating income (loss)	(6,149)		(13,260)
Loss before taxes		23,586		40,377
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total operating expenses	30,476	39,829	65,178	87,447
Operating income (loss)	$ (30,476)		$ (65,178)
Loss before taxes		$ (39,829)		$ (87,447)