LONG-TERM DEBT - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
LONG-TERM DEBT
Interest expense	$ 1,969	$ 2,799
Amortization of Deferred Financing Costs	165	150
Amortization of Discount on Convertible Notes	310	504
Total Interest Expense	2,444	3,453
Total Interest Paid	$ 1,395	$ 3,140