SEGMENT REPORTING - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	$ 27,042	$ 27,473
Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	191	201
Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	1,899	2,155
Energy operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	24,952	25,117
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	25,193	25,410
United States | Intellectual property operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	191	201
United States | Industrial operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	50	92
United States | Energy operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	24,952	25,117
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	1,760	1,949
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	1,760	1,949
Malaysia | Energy operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	0	0
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	89	114
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	89	114
Other foreign countries | Energy operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived tangible assets	$ 0	$ 0