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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2012
Jun. 28, 2013
William Blair & Company, L.L.C [Member]
Jun. 30, 2013
William Blair & Company, L.L.C [Member]
Jun. 25, 2013
William Blair & Company, L.L.C [Member]
Jan. 31, 2012
Minimum [Member]
May 31, 2003
Minimum [Member]
Jun. 30, 2013
2012 Plan [Member]
Jun. 30, 2013
Stock options [Member]
Jun. 30, 2012
Stock options [Member]
Jun. 30, 2013
Stock options [Member]
Jun. 30, 2012
Stock options [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2012
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
2012 Plan [Member]
Jun. 30, 2013
Restricted stock units [Member]
Jun. 30, 2013
Restricted stock units [Member]
Jun. 30, 2013
Outstanding Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Common stock, shares sold 29,916,403   29,916,403   25,995,216     2,857,142                          
Common stock, price per share               $ 5.25                          
Net proceeds from issuance of common stock     $ 13,877,447     $ 13,877,447                              
Underwriting discounts and commissions and other offering expenses           1,122,549                              
Additional shares of common stock to cover overallotments           428,571                              
Underwriter option exercised             2,100,000                            
Unrecognized compensation expense 7,256,141   7,256,141                 5,006,752   5,006,752         2,249,388 2,249,388  
Weighted average period for unrecognized compensation expense expected to be recognized                           2 years 9 months 26 days             3 years 3 months 7 days
Recognized compensation expense 685,633 830,986 2,045,767 1,983,870               494,608 662,148 1,478,226 1,600,317            
Total intrinsic value of options exercised     3,832,374 14,028,720                                  
Options outstanding 2,670,743 3,600,865 2,670,743 3,600,865 3,512,286                     671,254 515,834 196,254      
Weighted-average remaining contractual term, outstanding shares     7 years 4 months 24 days   6 years 5 months 16 days                                
Weighted-average exercise price, outstanding shares $ 4.01   $ 4.01   $ 3.39                     $ 4.79 $ 6.30        
Aggregate intrinsic value, outstanding shares 7,282,518   7,282,518                                    
Weighted-average remaining contractual term, exercisable shares       6 years 8 months 5 days                                  
Weighted-average exercise price, exercisable shares $ 3.04 $ 3.42 $ 3.04 $ 3.42                                  
Aggregate intrinsic value, exercisable shares   6,732,813   6,732,813                                  
Common stock reserved for issuance under stock holders incentive plan                 2,000,000                        
Purchase of common stock                   400,000 1,058,521                    
Number of common stock reserved for future grants                     970,529                    
Recognized stock-based compensation expense related to the outstanding RSUs                         $ 168,838   $ 383,553       $ 191,025 $ 567,541