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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 64	$ 200	$ 214	$ 249
Amortization of debt discount	1,033	3,069	3,422	3,812
Amortization of debt issuance costs	122	381	416	468
Total interest cost recognized	1,219	$ 3,650	4,052	$ 4,529
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Amortization of debt discount	5,587		7,373
Amortization of debt issuance costs	404		539
Total interest cost recognized	5,991		7,912
Convertible Senior Notes Due 2028
Debt Instrument [Line Items]
Amortization of debt discount	4,872		6,483
Amortization of debt issuance costs	236		315
Total interest cost recognized	$ 5,108		$ 6,798

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