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Share-Based Compensation - 2009 Stock-Based Incentive Compensation Plan (Details) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Options        
Outstanding at the beginning of the period (in shares) 589,168      
Outstanding at the end of the period (in shares) 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 259,598      
2009 Plan | Options        
Options        
Outstanding at the beginning of the period (in shares) 626,283 592,168 625,168  
Granted (in shares)   67,115    
Exercised (in shares) (67,115)   (20,000)  
Cancelled (in shares) (2,334) (33,000) (13,000)  
Outstanding at the end of the period (in shares) 556,834 626,283 592,168  
Vested and expected to vest (in shares) 556,834      
Options exercisable at the end of the period (in shares) 556,834      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 3.27 $ 3.35 $ 3.28  
Granted (in dollars per share)   2.81    
Exercised (in dollars per share) 2.81   1.95  
Cancelled (in dollars per share) 3.78 3.78 2.37  
Outstanding at the end of the period (in dollars per share) 3.32 $ 3.27 $ 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    
Exercised (in dollars) $ 55,705   $ 15,200  
Outstanding at the end of the period (in dollars) 177,043     $ 3,153,696
Vested and expected to vest (in dollars) 177,043      
Options exercisable at the end of the period (in dollars) $ 177,043      
2009 Plan | Performance-based Award | Employee        
Share-based compensation        
Maximum award (in shares) 300,000