SEGMENT REPORTING - Revenue by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 10,084	$ 15,878	$ 32,791	$ 46,102
Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,760	6,320	6,330	16,997
Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	8,324	9,558	26,461	29,105
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,472	10,525	15,103	29,029
Americas | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,758	6,312	3,325	16,383
Americas | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,714	4,213	11,778	12,646
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,232	10,307	13,802	28,249
United States | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,756	6,311	2,815	16,372
United States | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,476	3,996	10,987	11,877
Canada and Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	240	218	1,301	780
Canada and Latin America | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2	1	510	11
Canada and Latin America | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	238	217	791	769
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,840	2,282	6,767	7,677
Europe, Middle East and Africa | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	589
Europe, Middle East and Africa | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,840	2,282	6,767	7,088
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,772	3,071	10,921	9,396
Asia Pacific | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2	8	3,005	25
Asia Pacific | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,770	3,063	7,916	9,371
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	793	1,403	5,408	3,627
China | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	3,000	0
China | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	793	1,403	2,408	3,627
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,024	582	2,022	2,563
India | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	0	0	0
India | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,024	582	2,022	2,563
Asia-Pacific, excluding China and India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	955	1,086	3,491	3,206
Asia-Pacific, excluding China and India | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2	8	5	25
Asia-Pacific, excluding China and India | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 953	$ 1,078	$ 3,486	$ 3,181