CONVERTIBLE NOTES AND CREDIT FACILITY - Interest Expense (Details) - Convertible Debt - Senior Convertible Note - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Interest expense related to contractual coupon interest	$ 809	$ 809	$ 1,617	$ 1,617
Interest expense related to amortization of the debt discount	103	1,524	205	3,049
Interest expense, debt	$ 912	$ 2,333	$ 1,822	$ 4,666

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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