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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 64	$ 200	$ 278	$ 449
Amortization of debt discount	1,047	3,110	4,469	6,922
Amortization of debt issuance costs	123	380	539	848
Total interest cost recognized	1,234	$ 3,690	5,286	$ 8,219
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Amortization of debt discount	5,650		13,023
Amortization of debt issuance costs	404		943
Total interest cost recognized	6,054		13,966
Convertible Senior Notes Due 2028
Debt Instrument [Line Items]
Amortization of debt discount	4,929		11,412
Amortization of debt issuance costs	235		550
Total interest cost recognized	$ 5,164		$ 11,962

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