REVENUE RECOGNITION - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 7,074	$ 7,308
Royalty and license
Disaggregation of Revenue [Line Items]
Total revenues	7,009	7,230
Fixed fee license revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,214	1,745
Per-unit royalty revenue
Disaggregation of Revenue [Line Items]
Total revenues	5,795	5,485
Development, services, and other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 65	$ 78