SEGMENT REPORTING - Segment Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Revenues	$ 10,084	$ 15,878	$ 32,791	$ 46,102
Cost of revenues:
Inventor royalties	497	732	863	1,092
Contingent legal fees	346	1,010	890	2,314
Litigation and licensing expenses	2,026	939	5,663	3,272
Amortization of patents	2,601	2,601	7,802	7,802
Cost of sales	4,377	4,648	13,530	13,432
Total cost of revenues	9,847	9,930	28,748	27,912
Segment gross (loss) profit	237	5,948	4,043	18,190
Other operating expenses:
Engineering and development expenses - industrial operations	172	156	593	491
Sales and marketing expenses - industrial operations	1,613	2,119	5,385	6,429
Amortization of intangible assets	3,000		9,100
General and administrative expenses	13,872	15,038	35,338	36,813
Operating loss	(15,420)	(11,365)	(37,273)	(25,543)
Total other income (expense)	17,985	40,440	31,344	(81,216)
Income (loss) before income taxes	2,565	29,075	(5,929)	(106,759)
Parent Company
Other operating expenses:
General and administrative expenses	10,055	11,322	23,278	24,033
Operating Segments
Other operating expenses:
Engineering and development expenses - industrial operations	172	156	593	491
Sales and marketing expenses - industrial operations	1,613	2,119	5,385	6,429
Amortization of intangible assets	432	433	1,299	1,299
General and administrative expenses	3,385	3,283	10,761	11,481
Total other operating expenses	5,602	5,991	18,038	19,700
Operating loss	(5,365)	(43)	(13,995)	(1,510)
Intellectual property operations
Revenues:
Revenues	1,760	6,320	6,330	16,997
Cost of revenues:
Inventor royalties	497	732	863	1,092
Contingent legal fees	346	1,010	890	2,314
Litigation and licensing expenses	2,026	939	5,663	3,272
Amortization of patents	2,601	2,601	7,802	7,802
Cost of sales	0	0	0	0
Total cost of revenues	5,470	5,282	15,218	14,480
Segment gross (loss) profit	(3,710)	1,038	(8,888)	2,517
Intellectual property operations | Operating Segments
Other operating expenses:
Engineering and development expenses - industrial operations	0	0	0	0
Sales and marketing expenses - industrial operations	0	0	0	0
Amortization of intangible assets	0	0	0	0
General and administrative expenses	1,818	1,527	5,317	5,050
Total other operating expenses	1,818	1,527	5,317	5,050
Operating loss	(5,528)	(489)	(14,205)	(2,533)
Industrial operations
Revenues:
Revenues	8,324	9,558	26,461	29,105
Cost of revenues:
Inventor royalties	0	0	0	0
Contingent legal fees	0	0	0	0
Litigation and licensing expenses	0	0	0	0
Amortization of patents	0	0	0	0
Cost of sales	4,377	4,648	13,530	13,432
Total cost of revenues	4,377	4,648	13,530	13,432
Segment gross (loss) profit	3,947	4,910	12,931	15,673
Industrial operations | Operating Segments
Other operating expenses:
Engineering and development expenses - industrial operations	172	156	593	491
Sales and marketing expenses - industrial operations	1,613	2,119	5,385	6,429
Amortization of intangible assets	432	433	1,299	1,299
General and administrative expenses	1,567	1,756	5,444	6,431
Total other operating expenses	3,784	4,464	12,721	14,650
Operating loss	163	446	210	1,023
License fees
Revenues:
Revenues	1,760	6,320	6,330	16,997
License fees | Intellectual property operations
Revenues:
Revenues	1,760	6,320	6,330	16,997
License fees | Industrial operations
Revenues:
Revenues	0	0	0	0
Printers and parts
Revenues:
Revenues	2,852	3,799	9,640	11,715
Printers and parts | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Printers and parts | Industrial operations
Revenues:
Revenues	2,852	3,799	9,640	11,715
Consumable products
Revenues:
Revenues	4,576	4,710	14,074	14,308
Consumable products | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Consumable products | Industrial operations
Revenues:
Revenues	4,576	4,710	14,074	14,308
Services
Revenues:
Revenues	896	1,049	2,747	3,082
Services | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Services | Industrial operations
Revenues:
Revenues	$ 896	$ 1,049	$ 2,747	$ 3,082