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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 3	$ 330	$ 6	$ 660
Amortization of debt discount	15	1,621	748	3,183
Amortization of debt issuance costs	1	166	72	332
Total interest cost recognized	$ 19	$ 2,117	$ 826	$ 4,175

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