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Share-Based Compensation - 2009 Stock-Based Incentive Compensation Plan (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Options      
Outstanding at the beginning of the period (in shares) 645,168    
Outstanding at the end of the period (in shares) 589,168 645,168  
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 257,264    
2009 Plan | Options      
Options      
Outstanding at the beginning of the period (in shares) 592,168 625,168 680,334
Granted (in shares) 67,115    
Exercised (in shares)   (20,000) (44,666)
Cancelled (in shares) (33,000) (13,000) (10,500)
Outstanding at the end of the period (in shares) 626,283 592,168 625,168
Vested and expected to vest (in shares) 626,283    
Options exercisable at the end of the period (in shares) 559,168    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 3.35 $ 3.28 $ 3.32
Granted (in dollars per share) 2.81    
Exercised (in dollars per share)   1.95 3.78
Cancelled (in dollars per share) 3.78 2.37 3.78
Outstanding at the end of the period (in dollars per share) 3.27 $ 3.35 $ 3.28
Vested and expected to vest (in dollars per share) 3.27    
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)   $ 15,200 $ 178,823
Outstanding at the end of the period (in dollars)     $ 3,153,696
2009 Plan | Performance-based Award | Employee      
Share-based compensation      
Maximum award (in shares) 300,000