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DEBT - Schedule of Convertible Senior Notes due 2024 (Details) - Convertible Notes - Convertible Senior Notes Due 2024 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 2	$ 330	$ 8	$ 990
Amortization of debt discount	14	1,645	762	4,828
Amortization of debt issuance costs	1	166	73	498
Total interest cost recognized	$ 17	$ 2,141	$ 843	$ 6,316

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