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Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 72,523	$ 75,079	$ 216,763	$ 232,078
Increase/(Decrease) in Disaggregated Revenue	$ (2,556)		$ (15,315)
Percentage Increase/(Decrease) in Disaggregated Revenue	(3.00%)		(7.00%)
Revenue recognized that had been included in deferred revenue as of the beginning of the period			$ 120,300
Contract assets, current	$ 14,400		14,400		$ 19,700
Contract assets, non-current	1,300		1,300		$ 5,500
Total patent royalties
Disaggregation of Revenue [Line Items]
Revenue	68,049	74,045	207,994	230,018
Increase/(Decrease) in Disaggregated Revenue	$ (5,996)		$ (22,024)
Percentage Increase/(Decrease) in Disaggregated Revenue	(8.00%)		(10.00%)
Current patent royalties
Disaggregation of Revenue [Line Items]
Revenue	$ 68,419	73,917	$ 212,902	204,529
Increase/(Decrease) in Disaggregated Revenue	$ (5,498)		$ 8,373
Percentage Increase/(Decrease) in Disaggregated Revenue	(7.00%)		4.00%
Variable patent royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 4,683	13,645	$ 22,557	26,322
Increase/(Decrease) in Disaggregated Revenue	$ (8,962)		$ (3,765)
Percentage Increase/(Decrease) in Disaggregated Revenue	(66.00%)		(14.00%)
Fixed-fee royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 63,736	60,272	$ 190,345	178,207
Increase/(Decrease) in Disaggregated Revenue	$ 3,464		$ 12,138
Percentage Increase/(Decrease) in Disaggregated Revenue	6.00%		7.00%
Non-current patent royalties
Disaggregation of Revenue [Line Items]
Revenue	$ (370)	128	$ (4,908)	25,489
Increase/(Decrease) in Disaggregated Revenue	$ (498)		$ (30,397)
Percentage Increase/(Decrease) in Disaggregated Revenue	(389.00%)		(119.00%)
Current technology solutions revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 3,724	1,034	$ 7,794	2,060
Increase/(Decrease) in Disaggregated Revenue	$ 2,690		$ 5,734
Percentage Increase/(Decrease) in Disaggregated Revenue	260.00%		278.00%
Patent sales
Disaggregation of Revenue [Line Items]
Revenue	$ 750	$ 0	$ 975	$ 0
Increase/(Decrease) in Disaggregated Revenue	$ 750		$ 975
Percentage Increase/(Decrease) in Disaggregated Revenue	0.00%		0.00%

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