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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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