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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - Convertible Senior Notes Due 2025 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 342	$ 649
Amortization of debt discount	5,529	10,072
Amortization of debt issuance costs	661	1,229
Total interest cost recognized	$ 6,532	$ 11,950

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