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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Notes due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 64	$ 64	$ 128	$ 214
Amortization of debt discount	1,088	1,033	2,137	3,422
Amortization of debt issuance costs	123	122	241	416
Total interest cost recognized	1,275	1,219	2,506	4,052
Notes due 2028
Debt Instrument [Line Items]
Amortization of debt discount	0	4,872	0	6,483
Amortization of debt issuance costs	327	236	643	315
Total interest cost recognized	327	5,108	643	6,798
Notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount	0	5,587	0	7,373
Amortization of debt issuance costs	502	404	987	539
Total interest cost recognized	$ 502	$ 5,991	$ 987	$ 7,912

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