DEBT - Interest Expense (Details) - Convertible debt - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 29, 2020	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest rate	0.75%	0.75%	0.75%
Contractual interest expense (0.75% coupon)		$ 4,500	$ 3,825
Amortization of debt discount		0	12,898
Amortization of issuance costs		2,977	1,915
Interest expense		$ 7,477	$ 18,638
Weighted-average effective interest rate		1.30%	4.30%