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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended
Nov. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
day
$ / shares
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 01, 2019
USD ($)
Aggregate Notes          
Debt Instrument [Line Items]          
Debt instrument, strike price per share (in dollars per share) | $ / shares   $ 25.68      
Initial Notes          
Debt Instrument [Line Items]          
Payments for capped call transactions   $ 33,700,000      
Additional Notes          
Debt Instrument [Line Items]          
Payments for capped call transactions $ 9,300,000        
Convertible Debt | Aggregate Notes          
Debt Instrument [Line Items]          
Debt instrument, face value     $ 362,500,000 $ 362,500,000 $ 362,500,000
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, 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) | $ / shares   $ 39.50      
Convertible Debt | Aggregate Notes | Call Option          
Debt Instrument [Line Items]          
Option indexed to issuer's equity, indexed shares (in shares) | shares   14.1      
Convertible Debt | Initial Notes          
Debt Instrument [Line Items]          
Debt instrument, face value   $ 287,500,000      
Debt instrument, interest rate   0.50%      
Proceeds from issuance of debt   $ 245,800,000      
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