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Share-Based Compensation - Fair Value assumptions for 2009 stock option plan (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based compensation        
Share-based compensation expense   $ 251,000 $ 466,000 $ 810,000
2009 Plan        
Share-based compensation        
Share-based compensation expense   68,000 316,000 660,000
2009 Plan | Non-employee director        
Share-based compensation        
Share-based compensation expense   178,000 $ 192,000 $ 200,000
2009 Plan | Options        
Share-based compensation        
Share-based compensation expense $ 22,000      
Unrecognized compensation cost, related to non-vested stock options $ 59,000 $ 0    
2009 Plan | Options | Minimum        
Share-based compensation        
Vesting period   3 years    
2009 Plan | Options | Maximum        
Share-based compensation        
Expiration term   10 years    
Vesting period   5 years