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Stock-based Compensation - Stock options outstanding (Details) - Stock Options
 3 Months Ended 9 Months Ended
Jun. 30, 2016
$ / shares
shares
Jun. 30, 2016
$ / shares
shares
Shares    
Outstanding at beginning of period | shares 681,273 643,907
Granted | shares   115,074
Forfeited | shares (500) (3,734)
Outstanding at end of period | shares 755,247 755,247
Exercisable at end of period (shares) | shares 590,200 590,200
Vested or expected to vest in the future (shares) | shares 755,247 755,247
Weighted Average Exercise Price    
Outstanding at beginning of period (in dollars per share) | $ / shares $ 17.89 $ 18.13
Granted (in dollars per share) | $ / shares 7.53 9.90
Forfeited (in dollars per share) | $ / shares 7.32 17.03
Outstanding at end of period (in dollars per share) | $ / shares 16.88 16.88
Exercisable at end of period (in dollars per share) | $ / shares 18.04 18.04
Vested or expected to vest in the future (in dollars per share) | $ / shares $ 16.88 $ 16.88