NET INCOME (LOSS) PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income (loss), basic	$ (64,080)	$ 859,100	$ (23,848)
Add: Interest on convertible notes	0	8,313	0
Net income (loss), diluted	$ (64,080)	$ 867,413	$ (23,848)
Denominator:
Weighted average common shares outstanding, basic (in shares)	182,852	180,804	179,039
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Weighted average common shares outstanding, diluted (in shares)	182,852	191,678	179,039
Net loss per common share, basic (in usd per share)	$ (0.35)	$ 4.75	$ (0.13)
Net loss per common share, diluted (in usd per share)	$ (0.35)	$ 4.53	$ (0.13)
Stock Option
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	1,543	0
Common stock issuable under the 2027 Notes
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	2,874	0
Common stock issuable under the 2024 Notes
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	3,970	0
Unvested RSUs
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	1,938	0
Common stock potentially issuable for ESPP purchases
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	353	0
The Company's common stock held by the NQDC
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Effect of dilutive securities	0	196	0