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DEBT - Schedule of Convertible Senior Notes due in 2028 (Details) - Convertible Notes - Convertible Senior Notes Due 2028 - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Debt Instrument [Line Items]
Amortization of debt discount	$ 4,872	$ 6,483
Amortization of debt issuance costs	236	315
Total interest cost recognized	$ 5,108	$ 6,798

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