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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2019 USD ($) day $ / shares shares | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |
Debt instrument, strike price per share (in dollars per share) | $ 25.68 |  |
Payments for capped call transactions | $ | $ 33,700,000 |  |
Convertible Debt | Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face value | $ | $ 287,500,000 | $ 287,500,000 | $ 287,500,000
Debt instrument, interest rate | 0.50% |  |
Proceeds from issuance of debt | $ | $ 245,800,000 |  |
Debt instrument, convertible, conversion ratio | 0.0389484 |  |
Common stock, par value per share (in dollars per share) | $ 0.001 |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 25.68 |  |
Debt instrument, redemption price, percentage | 100.00% |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |
Debt instrument, convertible, threshold trading days | day | 20 |  |
Debt instrument, convertible, threshold consecutive trading days | day | 30 |  |
Debt instrument, initial cap price per share (in dollars per share) | $ 39.50 |  |
Convertible Debt | Convertible Senior Notes | Call Option |  |  |
Debt Instrument [Line Items] |  |  |
Option indexed to issuer's equity, indexed shares (in shares) | shares | 11.2 |  |

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