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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2019 USD ($) | Feb. 28, 2019 USD ($) day $ / shares shares | Mar. 31, 2020 USD ($) $ / shares | Dec. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  | $ 0.001 |  | $ 0.001
Debt issuance costs, net |  | $ 600,000 |  |  |
Convertible Debt | Convertible Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face value |  | $ 287,500,000 | $ 362,500,000 |  | $ 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) | $ / shares |  | $ 0.001 |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  | $ 25.68 |  |  |
Debt instrument, convertible, threshold trading days | day |  | 20 |  |  |
Debt instrument, convertible, threshold consecutive trading days | day |  | 30 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  | 130.00% |  |  |
Debt instrument, convertible, measurement period | day |  | 5 |  |  |
Debt instrument, convertible, threshold consecutive trading days preceding measurement period | day |  | 10 |  |  |
Debt instrument, threshold percentage of sales price per share |  | 98.00% |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |
Debt instrument, strike price per share (in dollars per share) | $ / shares |  | $ 25.68 |  |  |
Debt instrument, initial cap price per share (in dollars per share) | $ / shares |  | $ 39.50 |  |  |
Convertible Debt | Additional Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face value | $ 75,000,000 |  |  |  |
Debt instrument, interest rate | 0.50% |  |  |  |
Proceeds from issuance of debt | $ 64,600,000 |  |  |  |
Conversion option |  | $ 12,400,000 |  |  |
Debt instrument, effective interest rate |  | 5.30% |  |  |
Payments for capped call transactions |  | $ 9,300,000 | 9,288,000 |  |
Convertible Debt | Initial Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face value |  | $ 287,500,000 |  |  |
Debt instrument, interest rate |  | 0.50% |  |  |
Conversion option |  | $ 64,900,000 |  |  |
Debt instrument, effective interest rate |  | 6.50% |  |  |
Payments for capped call transactions |  | $ 33,700,000 | $ 33,724,000 |  |
Convertible Debt | Aggregate Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face value |  |  |  | $ 362,500,000 |
Call Option | Convertible Debt | Convertible Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Option indexed to issuer's equity, indexed shares (in shares) | shares |  | 14.1 |  |  |

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