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Convertible Senior Notes - Notes Due 2024 (Detail)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
D
Jul. 29, 2023
shares
Jul. 30, 2022
shares
Jul. 29, 2023
USD ($)
shares
Jul. 30, 2022
USD ($)
shares
Jun. 30, 2018
USD ($)
Debt Instrument            
Debt amount settled in cash       $ 1,696,000 $ 13,048,000  
Shares acquired from notes settlement | shares   3,698,887 1,000,000      
Common Stock            
Debt Instrument            
Shares acquired from notes settlement | shares   3,698,887 1,000,000 3,698,887 1,000,000  
Private Offering            
Debt Instrument            
Debt instrument, principal amount           $ 300,000,000
2024 Notes            
Debt Instrument            
Debt instrument, conversion principal amount $ 1,000          
Debt amount settled in cash         $ 3,600,000  
Shares issued upon conversion | shares         9,760  
Shares acquired from notes settlement | shares         9,760  
Debt instrument, convertible earliest date Jun. 15, 2024          
2024 Notes | Private Offering            
Debt Instrument            
Debt instrument, principal amount $ 350,000,000          
Debt instrument, interest rate 0.00%          
2024 Notes | Circumstances (1)            
Debt Instrument            
Debt instrument, convertible trading days | D 20          
Debt instrument, convertible consecutive trading days | D 30          
Debt instrument, convertible percentage of stock price 130.00%          
2024 Notes | Circumstances (2)            
Debt Instrument            
Debt instrument, convertible trading days | D 5          
Debt instrument, convertible consecutive trading days | D 10          
Debt instrument, convertible percentage of stock price 98.00%          
Debt instrument, conversion principal amount $ 1,000