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NET INCOME (LOSS) PER SHARE - Narrative (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 01, 2021	Mar. 09, 2020	Jun. 05, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	11,249	20,770	7,318	5,755
Convertible Senior Notes Due 2024 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)							$ 20.50
Convertible Senior Notes Due 2025 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)						$ 81.54
Convertible Senior Notes Due 2026 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)					$ 307.47
Convertible Senior Notes Due 2028 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)					$ 284.87