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DEBT - Interest Expense (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
DEBT - Interest Expense (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Effective interest rate		4.31%	4.31%
Convertible debt
Debt Instrument [Line Items]
Interest rate	0.75%
Contractual interest expense (0.75% coupon)		$ 3,825
Amortization of debt discount		12,898
Amortization of issuance costs		1,915
Interest expense		$ 18,638