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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intellectual Property Operations (Details) - Intellectual property operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Inventor royalties | $ 1,142 | $ 7,349
Contingent legal fees | 12,074 | 7,419
Litigation and licensing expenses | 5,462 | 5,683
Amortization of patents | 9,851 | 4,681
Other patent portfolio expense (income) | 162 | (308)
Total cost of revenues | $ 28,691 | $ 24,824

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