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Convertible Senior Notes - Carrying Values of Notes Excluding the Discounts upon Original Issuance and Third Party Offering Costs (Detail) - USD ($)
$ in Thousands
Nov. 02, 2019
Sep. 30, 2019
Feb. 02, 2019
Jun. 30, 2018
Jun. 30, 2015
Convertible senior notes due 2024          
Liability component          
Principal $ 350,000        
Less: Debt discount (85,448) $ (3,500)      
Net carrying amount 264,552        
Equity component 87,252        
Convertible senior notes due 2023          
Liability component          
Principal 335,000   $ 335,000    
Less: Debt discount (68,974)   (81,311) $ (1,700)  
Net carrying amount 266,026   253,689    
Equity component 90,990   90,990    
Convertible senior notes due 2020          
Liability component          
Principal 300,000   300,000    
Less: Debt discount (13,548)   (27,081)   $ (3,800)
Net carrying amount 286,452   272,919    
Equity component $ 84,003   $ 84,003