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Loss Per Common Share - Additional Information (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2018
shares
Mar. 31, 2017
shares
Mar. 31, 2018
shares
Mar. 31, 2017
shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Split of common stock ratio     2  
Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Number of Stock options 194,600 206,300 194,600 206,300