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Nature of Operations and Summary of Significant Accounting Policies - Potentially Dilutive Common Shares (Detail)
3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive common shares outstanding 3,940,210 4,506,305
Stock options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive common shares outstanding 2,754,030 3,780,471
Warrants [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive common shares outstanding 6,667 6,667
Restricted stock units [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive common shares outstanding 1,179,513 719,167