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SEGMENT REPORTING - Revenue by Geographical Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 7,904 $ 16,717 $ 22,707 $ 30,224
Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 394 8,062 4,570 10,677
Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 7,510 8,655 18,137 19,547
Americas        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 4,004 12,180 9,631 18,504
Americas | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 393 7,968 1,567 10,071
Americas | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 3,611 4,212 8,064 8,433
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 3,663 11,996 8,570 17,942
United States | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 386 7,964 1,059 10,061
United States | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 3,277 4,032 7,511 7,881
Canada and Latin America        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 341 184 1,061 562
Canada and Latin America | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 7 4 508 10
Canada and Latin America | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 334 180 553 552
Europe, Middle East and Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1,962 2,387 4,927 5,395
Europe, Middle East and Africa | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 0 89 0 589
Europe, Middle East and Africa | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1,962 2,298 4,927 4,806
Asia Pacific        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1,938 2,150 8,149 6,325
Asia Pacific | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1 5 3,003 17
Asia Pacific | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1,937 2,145 5,146 6,308
China        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 772 1,091 4,615 2,224
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 772 1,091 1,615 2,224
India        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 170 232 998 1,981
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 170 232 998 1,981
Asia-Pacific, excluding China and India        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 996 827 2,536 2,120
Asia-Pacific, excluding China and India | Intellectual property operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 1 5 3 17
Asia-Pacific, excluding China and India | Industrial operations        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 995 $ 822 $ 2,533 $ 2,103