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Stockholders' Equity - Stock Option Activity (Detail) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Number of Shares, Beginning balance 3,512,286 4,553,904 4,534,328  
Number of Shares, Granted 651,563 1,095,750 976,531  
Number of Shares, Exercised (1,103,582) (1,812,215) (942,639)  
Number of Shares, Cancelled (235,303) (325,153) (14,316)  
Number of Shares, Ending balance 2,824,964 3,512,286 4,553,904 4,534,328
Weighted Average Exercise Price Per Share, Beginning balance $ 3.39 $ 1.34 $ 0.66  
Weighted Average Exercise Price Per Share, Granted $ 3.63 $ 8.54 $ 3.70  
Weighted Average Exercise Price Per Share, Exercised $ 0.90 $ 0.81 $ 0.53  
Weighted Average Exercise Price Per Share, Cancelled $ 7.26 $ 6.41 $ 0.57  
Weighted Average Exercise Price Per Share, Ending balance $ 4.09 $ 3.39 $ 1.34 $ 0.66
Weighted Average Remaining Contractual Term, Beginning balance 7 years 3 months 15 days 6 years 5 months 16 days 6 years 1 month 24 days 6 years 2 months 16 days