REVENUE RECOGNITION - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 35,089	$ 30,456
Royalty and license
Disaggregation of Revenue [Line Items]
Revenue	34,689	30,176
Fixed fee license revenue
Disaggregation of Revenue [Line Items]
Revenue	5,843	5,472
Per-unit royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	28,846	24,704
Development, services, and other
Disaggregation of Revenue [Line Items]
Revenue	$ 400	$ 280