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Share-Based Compensation - 2009 Stock-Based Incentive Compensation Plan (Details) - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Options      
Outstanding at the beginning of the period (in shares) 586,834 589,168  
Outstanding at the end of the period (in shares) 550,834 586,834 589,168
2009 Plan      
Share-based compensation      
Number of shares of common stock reserved for awards 1,200,000    
Number of shares of common stock available for awards under the plan 208,128    
2009 Plan | Options      
Options      
Outstanding at the beginning of the period (in shares) 556,834 626,283 592,168
Granted (in shares)     67,115
Exercised (in shares)   (67,115)  
Cancelled (in shares) (6,000) (2,334) (33,000)
Outstanding at the end of the period (in shares) 550,834 556,834 626,283
Vested and expected to vest (in shares) 550,834    
Options exercisable at the end of the period (in shares) 550,834    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 3.32 $ 3.35 $ 3.35
Granted (in dollars per share)   2.81 2.81
Cancelled (in dollars per share) 3.78 3.78 3.78
Outstanding at the end of the period (in dollars per share) 3.32 $ 3.32 $ 3.35
Vested and expected to vest (in dollars per share) 3.32    
Options exercisable at the end of the period (in dollars per share) $ 3.32    
Aggregate Intrinsic Value      
Granted (in dollars)   $ 25,504 $ 25,504
Exercised (in dollars)   55,705  
Outstanding at the end of the period (in dollars) $ 15,000 $ 177,043  
Vested and expected to vest (in dollars) 15,000    
Options exercisable at the end of the period (in dollars) $ 15,000    
2009 Plan | Performance-based Award | Employee      
Share-based compensation      
Maximum award (in shares) 300,000