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Stockholders' Equity - Stock Option Activity (Detail) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Number of Shares, Beginning balance 2,824,964 3,512,286 4,553,904  
Number of Shares, Granted 0 651,563 1,095,750  
Number of Shares, Exercised (108,135) (1,103,582) (1,812,215)  
Number of Shares, Cancelled (382,503) (235,303) (325,153)  
Number of Shares, Ending balance 2,334,326 2,824,964 3,512,286 4,553,904
Weighted Average Exercise Price Per Share, Beginning balance $ 4.09 $ 3.39 $ 1.34  
Weighted Average Exercise Price Per Share, Granted   $ 3.63 $ 8.54  
Weighted Average Exercise Price Per Share, Exercised $ 1.27 $ 0.90 $ 0.81  
Weighted Average Exercise Price Per Share, Cancelled $ 4.77 $ 7.26 $ 6.41  
Weighted Average Exercise Price Per Share, Ending balance $ 4.11 $ 4.09 $ 3.39 $ 1.34
Weighted Average Remaining Contractual Term, Beginning balance 5 years 5 months 16 days 7 years 3 months 15 days 6 years 5 months 16 days 6 years 1 month 24 days