SEGMENT REPORTING - Revenue by geographical area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 88,047	$ 29,782
Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	76,043
Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,004
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,846
Americas | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	23,658
Americas | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,188
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,193
United States | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	23,256
United States | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,937
Canada and Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	653
Canada and Latin America | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	402
Canada and Latin America | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	251
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,430
Europe, Middle East and Africa | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,841
Europe, Middle East and Africa | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,589
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	54,771
Asia Pacific | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	50,544
Asia Pacific | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,227
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,910
China | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0
China | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,910
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,076
India | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0
India | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,076
Asia-Pacific, excluding China and India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	51,785
Asia-Pacific, excluding China and India | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	50,544
Asia-Pacific, excluding China and India | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,241