COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
COMMITMENTS AND CONTINGENCIES
Revenue Recognition	$ 52,979	$ 51,337	$ 151,223	$ 158,581
Unapproved Products [Member]
COMMITMENTS AND CONTINGENCIES
Revenue Recognition	4,300	4,700	12,400	15,500
Unapproved Products [Member] | Contract Customer [Member]
COMMITMENTS AND CONTINGENCIES
Revenue Recognition	$ 700	$ 500	$ 2,300	$ 2,000