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Nature of Operations and Summary of Significant Accounting Policies - Potentially Dilutive Common Shares (Detail)
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total potentially dilutive common shares outstanding 3,348,664 4,071,700 3,348,664 4,071,700
Stock options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total potentially dilutive common shares outstanding 2,670,743 3,600,865 2,670,743 3,600,865
Restricted stock units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total potentially dilutive common shares outstanding 671,254 464,168 671,254 464,168
Warrants [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total potentially dilutive common shares outstanding 6,667 6,667 6,667 6,667