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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Notes due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 64	$ 150
Amortization of debt discount	1,049	2,389
Amortization of debt issuance costs	118	294
Total interest cost recognized	1,231	2,833
Notes due 2028
Debt Instrument [Line Items]
Amortization of debt discount	0	1,611
Amortization of debt issuance costs	316	79
Total interest cost recognized	316	1,690
Notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount	0	1,786
Amortization of debt issuance costs	485	135
Total interest cost recognized	$ 485	$ 1,921

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