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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intellectual Property Operations (Details) - Intellectual property operations - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Inventor royalties | $ 170 | $ 95
Contingent legal fees | 549 | 1,094
Litigation and licensing expenses | 1,244 | 2,262
Amortization of patents | 2,601 | 1,862
Total cost of revenues | $ 4,564 | $ 5,313

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