Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

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Stockholders' Equity - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Class Of Stock [Line Items]      
Repurchase of common stock 33,926 106,567  
Payment for repurchase of common stock $ 383 $ 759  
Series E Convertible Preferred Stock      
Class Of Stock [Line Items]      
Preferred stock, outstanding 47,840   47,840
Repurchased shares of preferred stock   30,000  
Aggregate purchase price of convertible preferred stock   $ 3