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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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