REVENUE RECOGNITION - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 6,983	$ 7,983	$ 14,057	$ 15,291
Royalty and license
Disaggregation of Revenue [Line Items]
Total revenues	6,918	7,918	13,927	15,148
Fixed fee license revenue
Disaggregation of Revenue [Line Items]
Total revenues	1,189	1,246	2,404	2,991
Per-unit royalty revenue
Disaggregation of Revenue [Line Items]
Total revenues	5,729	6,672	11,523	12,157
Development, services, and other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 65	$ 65	$ 130	$ 143