SEGMENT REPORTING - Segment Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Revenues	$ 7,904	$ 16,717	$ 22,707	$ 30,224
Cost of revenues:
Inventor royalties	145	190	366	360
Contingent legal fees	12	755	544	1,304
Litigation and licensing expenses	2,253	1,089	3,637	2,333
Amortization of patents	2,600	2,600	5,201	5,201
Cost of sales	3,933	4,592	9,153	8,784
Total cost of revenues	8,943	9,226	18,901	17,982
Segment gross (loss) profit	(1,039)	7,491	3,806	12,242
Other operating expenses:
Engineering and development expenses - industrial operations	205	145	421	335
Sales and marketing expenses - industrial operations	1,859	2,294	3,772	4,310
Amortization of intangible assets	3,000		6,100
General and administrative expenses	9,426	10,722	21,466	21,775
Operating loss	(12,529)	(5,670)	(21,853)	(14,178)
Total other income (expense)	(7,895)	(42,020)	13,359	(121,656)
Loss before income taxes	(20,424)	(47,690)	(8,494)	(135,834)
Parent Company
Other operating expenses:
General and administrative expenses	5,798	6,229	13,223	12,711
Operating Segments
Other operating expenses:
Engineering and development expenses - industrial operations	205	145	421	335
Sales and marketing expenses - industrial operations	1,859	2,294	3,772	4,310
Amortization of intangible assets	434	433	867	866
General and administrative expenses	3,194	4,060	7,376	8,198
Total other operating expenses	5,692	6,932	12,436	13,709
Operating loss	(6,731)	559	(8,630)	(1,467)
Intellectual property operations
Revenues:
Revenues	394	8,062	4,570	10,677
Cost of revenues:
Inventor royalties	145	190	366	360
Contingent legal fees	12	755	544	1,304
Litigation and licensing expenses	2,253	1,089	3,637	2,333
Amortization of patents	2,600	2,600	5,201	5,201
Cost of sales	0	0	0	0
Total cost of revenues	5,010	4,634	9,748	9,198
Segment gross (loss) profit	(4,616)	3,428	(5,178)	1,479
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	1,602	1,807	3,499	3,523
Total other operating expenses	1,602	1,807	3,499	3,523
Operating loss	(6,218)	1,621	(8,677)	(2,044)
Industrial operations
Revenues:
Revenues	7,510	8,655	18,137	19,547
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	3,933	4,592	9,153	8,784
Total cost of revenues	3,933	4,592	9,153	8,784
Segment gross (loss) profit	3,577	4,063	8,984	10,763
Industrial operations | Operating Segments
Other operating expenses:
Engineering and development expenses - industrial operations	205	145	421	335
Sales and marketing expenses - industrial operations	1,859	2,294	3,772	4,310
Amortization of intangible assets	434	433	867	866
General and administrative expenses	1,592	2,253	3,877	4,675
Total other operating expenses	4,090	5,125	8,937	10,186
Operating loss	(513)	(1,062)	47	577
License fees
Revenues:
Revenues	394	8,062	4,570	10,677
License fees | Intellectual property operations
Revenues:
Revenues	394	8,062	4,570	10,677
License fees | Industrial operations
Revenues:
Revenues	0	0	0	0
Printers and parts
Revenues:
Revenues	2,324	3,662	6,788	7,916
Printers and parts | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Printers and parts | Industrial operations
Revenues:
Revenues	2,324	3,662	6,788	7,916
Consumable products
Revenues:
Revenues	4,328	4,214	9,498	9,598
Consumable products | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Consumable products | Industrial operations
Revenues:
Revenues	4,328	4,214	9,498	9,598
Services
Revenues:
Revenues	858	779	1,851	2,033
Services | Intellectual property operations
Revenues:
Revenues	0	0	0	0
Services | Industrial operations
Revenues:
Revenues	$ 858	$ 779	$ 1,851	$ 2,033