REVENUE RECOGNITION - NARRATIVE (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Decrease in royalty revenue recognized true-ups	$ 20,000
Contract assets - current	7,787,000	$ 7,787,000	$ 13,128,000
Contract assets - long-term	$ 5,991,000	5,991,000	$ 6,928,000
Decrease in contract with customer, asset		$ (6,200,000)