Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.20.2
Stockholders' Equity - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Class Of Stock [Line Items]      
Treasury stock purchased, shares 106,567 43,347  
Payment for treasury stock $ 759 $ 321  
Series E Convertible Preferred Stock      
Class Of Stock [Line Items]      
Preferred stock, outstanding 47,840   77,840
Repurchased shares of preferred stock 30,000    
Aggregate purchase price of convertible preferred stock $ 3