Segment And Geographic Information - Schedule of Operating Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting [Abstract]
Reportable segments | segment	2
Segment Reporting Information [Line Items]
Revenues	$ 373,732	$ 259,565	$ 273,300
Operating expenses	405,232	170,177	111,098
Operating income (loss)	(31,500)	89,388	162,202
DTS Merger
Segment Reporting Information [Line Items]
Revenues		273,300
Operating Segments | Product licensing segment
Segment Reporting Information [Line Items]
Revenues	167,923	30,499	31,335
Operating expenses	172,745	25,299	11,191
Operating income (loss)	(4,822)	5,200	20,144
Operating Segments | Semiconductor and IP licensing segment
Segment Reporting Information [Line Items]
Revenues	205,809	229,066	241,965
Operating expenses	87,838	72,812	56,315
Operating income (loss)	117,971	156,254	185,650
Unallocated operating expenses
Segment Reporting Information [Line Items]
Revenues		100	1,300
Operating expenses	144,649	72,066	43,592
Operating income (loss)	(144,649)	$ (72,066)	$ (43,592)
Unallocated operating expenses | DTS Merger | Acquisition-related costs
Segment Reporting Information [Line Items]
Business acquisition costs	$ 23,900