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Stockholders' Equity - Stock Option Activity (Detail) (USD $)
 9 Months Ended 12 Months Ended
Jun. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Beginning balance 3,512,286   3,600,865
Number of Shares, Granted 489,063    
Number of Shares, Exercised (1,103,582)    
Number of Shares, Cancelled (227,024)    
Number of Shares, Ending balance 2,670,743 3,512,286 3,600,865
Weighted Average Exercise Price Per Share, Beginning balance $ 3.39    
Weighted Average Exercise Price Per Share, Granted $ 2.96    
Weighted Average Exercise Price Per Share, Exercised $ 0.90    
Weighted Average Exercise Price Per Share, Cancelled $ 7.25    
Weighted Average Exercise Price Per Share, Ending balance $ 4.01 $ 3.39  
Weighted Average Remaining Contractual Term, Beginning balance 7 years 4 months 24 days 6 years 5 months 16 days  
Weighted Average Remaining Contractual Term, Ending balance 7 years 4 months 24 days 6 years 5 months 16 days