CONVERTIBLE NOTES AND CREDIT FACILITY - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Interest expense, debt	$ 2,300		$ 7,000
Convertible Debt \| Senior Convertible Note
Debt Instrument [Line Items]
Interest expense related to contractual coupon interest	809	$ 117	2,426	$ 117
Interest expense related to amortization of the debt discount	1,524	220	4,573	220
Interest expense, debt	$ 2,333	$ 337	$ 6,999	$ 337

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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