INDEBTEDNESS - Facility components (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current debt, net of deferred financing costs	$ 12,329	$ 9,941
Non-current debt, net of deferred financing costs and current component	177,879	175,808
Term Loan and DDTL [Member]
Current borrowing on debt	12,790	10,412
Deferred financing costs	(461)	(471)
Current debt, net of deferred financing costs	12,329	9,941
Non-current borrowing on debt	171,412	177,069
Deferred financing costs	(1,033)	(1,261)
Non-current debt, net of deferred financing costs and current component	$ 170,379	$ 175,808