REVENUE RECOGNITION AND RELATED ALLOWANCES - Timing (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue Recognition	$ 52,979	$ 51,337	$ 151,223	$ 158,581
Performance obligations satisfied in prior periods			8,700	6,500
Contract with Customer, Asset, Net	100		100		$ 100
Deferred revenue	112		112		$ 451
Revenue recognized			300
Performance obligations transferred at a point in time [Member]
Revenue Recognition	52,690	51,262	149,472	157,775
Performance obligations transferred over time [Member]
Revenue Recognition	$ 289	$ 75	$ 1,751	$ 806