REVENUE RECOGNITION - NARRATIVE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Royalty Revenue, Adjustment	$ (500,000)	$ 300,000
Contract with customer, asset, current	10,756,000		$ 10,756,000	$ 11,623,000
Contract assets - long-term	2,451,000		2,451,000	$ 4,596,000
Increase (Decrease) in Contract with Customer, Asset			(3,000,000)
Capitalized contract costs during the period	$ 14,000		$ 200,000