CONVERTIBLE NOTES AND CREDIT FACILITY - Interest Expense (Details) - Convertible Debt - Convertible Senior Notes - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Interest expense related to contractual coupon interest	$ 809	$ 809
Interest expense related to amortization of the debt discount	102	1,524
Interest expense, debt	$ 911	$ 2,333

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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