INDEBTEDNESS - Facility components (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current debt, net of deferred financing costs	$ 14,438	$ 13,243
Non-current debt, net of deferred financing costs and current component	168,985	172,443
Term Loan and DDTL [Member]
Current borrowing on debt	14,880	13,691
Deferred financing costs	(442)	(448)
Current debt, net of deferred financing costs	14,438	13,243
Non-current borrowing on debt	162,189	165,755
Deferred financing costs	(704)	(812)
Non-current debt, net of deferred financing costs and current component	$ 161,485	$ 164,943