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SEGMENT REPORTING - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 3,885 $ 4,183
Intellectual property operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 198 204
Industrial operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 3,687 3,979
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 621 677
United States | Intellectual property operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 198 204
United States | Industrial operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 423 473
Malaysia    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 2,983 3,203
Malaysia | Intellectual property operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 0 0
Malaysia | Industrial operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 2,983 3,203
Other foreign countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 281 303
Other foreign countries | Intellectual property operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 0 0
Other foreign countries | Industrial operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 281 $ 303