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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 14, 2021
Jul. 17, 2020
Long-term debt        
Amortization of debt issuance costs $ 464 $ 452    
Effective interest rate of the liability component 10.10%     11.00%
1.50% Convertible senior notes due 2026        
Long-term debt        
Contractual interest expense $ 1,069 1,069    
Amortization of debt issuance costs 283 277    
Total $ 1,352 $ 1,346 $ 2,100  
Effective interest rate of the liability component 1.90% 1.90%    
Convertible debt | 3.00% Convertible senior notes due 2022        
Long-term debt        
Contractual interest expense $ 1,110 $ 1,110    
Amortization of debt issuance costs 181 175    
Total $ 1,291 $ 1,285    
Effective interest rate of the liability component 3.50% 3.50%