SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 13,507	$ 5,803
Intellectual property operations
Disaggregation of Revenue [Line Items]
Total revenues	2,615	5,803
Paid-up license revenue agreements
Disaggregation of Revenue [Line Items]
Total revenues	2,193	5,410
Recurring License Revenue Agreements
Disaggregation of Revenue [Line Items]
Total revenues	422	393
Industrial operations
Disaggregation of Revenue [Line Items]
Total revenues	10,892	$ 0
Printers, consumables and parts
Disaggregation of Revenue [Line Items]
Total revenues	9,638
Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,254