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CONVERTIBLE SENIOR NOTES - Proceeds from Notes (Details) - 2023 Convertible Senior Notes - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2018 | Oct. 31, 2020 | Jul. 31, 2020
Debt Instrument [Line Items] |  |  |
Payments for convertible note hedges | $ (143,200) |  |
Proceeds from issuance of warrants | 88,000 |  |
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 575,000 | $ 575,000 | $ 575,000
Less: initial purchasers' discount | (10,781) |  |
Payments for convertible note hedges | (143,175) |  |
Proceeds from issuance of warrants | 87,975 |  |
Less: other issuance costs | (707) |  |
Net proceeds | $ 508,312 |  |

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