Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 124,657	$ 87,735	$ 225,975	$ 170,098
Increase/(decrease) in disaggregated revenue	$ 36,922		$ 55,877
Percentage increase/(decrease) in disaggregated revenue	42.00%		33.00%
Total patent royalties
Disaggregation of Revenue [Line Items]
Revenue	$ 123,985	86,205	$ 225,064	166,378
Increase/(decrease) in disaggregated revenue	$ 37,780		$ 58,686
Percentage increase/(decrease) in disaggregated revenue	44.00%		35.00%
Total patent royalties \| Current revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 99,429	76,619	$ 198,317	153,011
Increase/(decrease) in disaggregated revenue	$ 22,810		$ 45,306
Percentage increase/(decrease) in disaggregated revenue	30.00%		30.00%
Total patent royalties \| Non-current revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 24,556	9,586	$ 26,747	13,367
Increase/(decrease) in disaggregated revenue	$ 14,970		$ 13,380
Percentage increase/(decrease) in disaggregated revenue	156.00%		100.00%
Technology solutions
Disaggregation of Revenue [Line Items]
Revenue	$ 672	1,530	$ 911	3,720
Increase/(decrease) in disaggregated revenue	$ (858)		$ (2,809)
Percentage increase/(decrease) in disaggregated revenue	(56.00%)		(76.00%)
Variable patent royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 7,673	7,323	$ 16,718	14,419
Increase/(decrease) in disaggregated revenue	$ 350		$ 2,299
Percentage increase/(decrease) in disaggregated revenue	5.00%		16.00%
Fixed-fee royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 91,756	$ 69,296	$ 181,599	$ 138,592
Increase/(decrease) in disaggregated revenue	$ 22,460		$ 43,007
Percentage increase/(decrease) in disaggregated revenue	32.00%		31.00%