SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intellectual Property Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Inventor royalties	$ 190		$ 360
Contingent legal fees	755		1,304
Litigation and licensing expenses	1,089		2,333
Amortization of patents	2,600		5,201
Total cost of revenues	9,226		17,982
Intellectual property operations
Disaggregation of Revenue [Line Items]
Inventor royalties	190	$ 448	360	$ 543
Contingent legal fees	755	4,356	1,304	5,450
Litigation and licensing expenses	1,089	1,837	2,333	4,099
Amortization of patents	2,600	2,612	5,201	4,474
Total cost of revenues	$ 4,634	$ 9,253	$ 9,198	$ 14,566