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SEGMENT REPORTING - Long-lived assets by geographic area (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets $ 4,183
Intellectual property operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 204
Industrial operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 3,979
United States  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 677
United States | Intellectual property operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 204
United States | Industrial operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 473
Malaysia  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 3,203
Malaysia | Intellectual property operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 0
Malaysia | Industrial operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 3,203
Other foreign countries  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 303
Other foreign countries | Intellectual property operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets 0
Other foreign countries | Industrial operations  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Long-lived tangible assets $ 303