CREDIT FACILITY AND LONG-TERM DEBT CREDIT FACILITY AND LONG-TERM DEBT - Interest Expense Related to the Notes (Details) - Senior Convertible Note - Convertible Debt - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest expense related to contractual coupon interest	$ 3,234	$ 925
Interest expense related to amortization of the debt discount	3,111	1,744
Total interest expense related to debt	$ 6,345	$ 2,669

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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