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DEBT - Schedule of Convertible Senior Notes due 2024 (Details) - Convertible Notes - Convertible Senior Notes Due 2024 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 8	$ 1,284
Amortization of debt discount	772	6,325
Amortization of debt issuance costs	74	646
Total interest cost recognized	$ 854	$ 8,255

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