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SEGMENT REPORTING - Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Fair Value | $ 246,484 | $ 361,778
Equity securities without readily determinable fair value | 5,816 | 5,816
Investment securities - equity method investments | 30,934 | 30,934
Cost | 283,234 | 398,528
Other parent assets | 152,283 | 172,726
Total assets | 661,440 | 798,856
Intellectual property operations |  |
Segment Reporting Information [Line Items] |  |
Total assets | 171,647 | 175,286
Industrial operations |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 54,276 | $ 52,316

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