DEBT - Interest Expense (Details) - Convertible debt - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 29, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Interest rate	0.75%	0.75%	0.75%	0.75%	0.75%
Contractual interest expense (0.75% coupon)		$ 1,125	$ 1,125	$ 2,250	$ 2,250
Amortization of issuance costs		720	675	1,439	1,348
Interest expense		$ 1,845	$ 1,800	$ 3,689	$ 3,598
Weighted-average effective interest rate		1.20%	1.20%	1.20%	1.20%