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Convertible Senior Notes - Notes Due 2024 (Detail)
1 Months Ended 3 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Apr. 29, 2023
USD ($)
Apr. 30, 2022
USD ($)
shares
Jul. 30, 2022
USD ($)
Jun. 30, 2018
USD ($)
Debt Instrument            
Debt amount settled in cash     $ 2,000 $ 13,048,000    
Loss on extinguishment of debt       (146,116,000)    
Private Offering            
Debt Instrument            
Debt instrument, principal amount           $ 300,000,000
2024 Notes            
Debt Instrument            
Debt instrument, conversion principal amount $ 1,000 $ 1,000        
Debt amount settled in cash       $ 3,600,000    
Shares issued upon conversion | shares       9,760    
Debt instrument, convertible earliest date Jun. 15, 2024 Jun. 15, 2024        
Shares acquired from notes settlement | shares       9,760    
2024 Notes | Private Offering            
Debt Instrument            
Debt instrument, principal amount $ 350,000,000 $ 350,000,000     $ 350,000,000  
Debt instrument, interest rate 0.00% 0.00%        
2024 Notes | Circumstances (1)            
Debt Instrument            
Debt instrument, convertible trading days   20        
Debt instrument, convertible consecutive trading days   30        
Debt instrument, convertible percentage of stock price   130.00%        
2024 Notes | Circumstances (2)            
Debt Instrument            
Debt instrument, convertible trading days   5        
Debt instrument, convertible consecutive trading days   10        
Debt instrument, convertible percentage of stock price       98.00%    
Debt instrument, conversion principal amount $ 1,000 $ 1,000