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Unsecured Convertible Senior Notes - 2023 Unsecured Convertible Senior Notes (Details)
$ / shares in Units, shares in Millions
1 Months Ended
Nov. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Aug. 14, 2020
USD ($)
Debt Instrument [Line Items]      
Unamortized debt issuance costs   $ 5,211,000  
2023 Unsecured Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount $ 210,000,000.0    
Interest rate (as a percent) 6.25%    
Principal amount of debt repurchased     $ 115,000,000.0
Unamortized debt issuance costs   $ 789,000  
Effective interest rate to determine fair value of liability component (as a percent)   7.00%  
Conversion rate 0.0520183    
Value used in calculation of conversion rate $ 1,000    
Conversion price | $ / shares $ 19.22    
Shares upon conversion | shares 4.9    
Number of shares outstanding on the 2023 Capped Call | shares   4.9  
2023 Unsecured Convertible Senior Notes | Minimum      
Debt Instrument [Line Items]      
Conversion price | $ / shares $ 19.22    
2023 Unsecured Convertible Senior Notes | Maximum      
Debt Instrument [Line Items]      
Conversion price | $ / shares $ 28.84