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REVENUE RECOGNITION - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 11,464 | $ 10,624 | $ 8,743 | $ 5,122 | $ 10,867 | $ 8,552 | $ 6,144 | $ 85,416 | $ 35,953 | $ 110,979 | $ 35,013
Contract with customer, asset, current | 13,100 |  |  |  | 9,000 |  |  |  | 13,100 | 9,000 |
Contract assets - Long-term | $ 6,928 |  |  |  | $ 7,231 |  |  |  | 6,928 | 7,231 |
Increase (decrease) in contract with customer, asset |  |  |  |  |  |  |  |  | 3,900 |  |
Royalty and license |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,643 | 110,557 | 34,089
Fixed fee license revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,627 | 83,573 | 12,575
Per-unit royalty revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,016 | 26,984 | 21,514
Development, services, and other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 310 | $ 422 | $ 924

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