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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 113 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Aug. 10, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Oct. 21, 2011
Feb. 29, 2012
Series A Preferred Stock [Member]
Oct. 31, 2011
Series A Preferred Stock [Member]
Sep. 30, 2012
Series A Preferred Stock [Member]
Oct. 24, 2011
Series A Preferred Stock [Member]
Oct. 31, 2011
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Sep. 30, 2010
Common Stock [Member]
Sep. 30, 2005
Common Stock [Member]
Oct. 04, 2011
Common Stock [Member]
Sep. 30, 2012
Limited Liability Company [Member]
Sep. 30, 2012
Scenario, Forecast [Member]
Common Stock [Member]
Oct. 31, 2011
Subscription Agreement [Member]
Oct. 31, 2011
Subscription Agreement [Member]
Series A Preferred Stock [Member]
Sep. 30, 2012
2000 Stock Option Plan [Member]
Sep. 30, 2012
2004 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Capital stock authorized for issuance   150,000,000   150,000,000                                    
Common stock, shares authorized   145,000,000 145,000,000 145,000,000                                    
Common stock, par value   $ 0.001 $ 0.001 $ 0.001 $ 0.001                                  
Preferred stock, shares authorized   5,000,000 5,000,000 5,000,000                                    
Preferred stock, par value   $ 0.001 $ 0.001 $ 0.001         $ 0.001                          
Common stock, shares outstanding   13,579,185 8,642,286 13,579,185                                    
Share reserve for issuance                                         153,200 1,965,860
Issuance and sold of Common Stock 2,260,869                 138,158 1,458,917 15,511 8,656 225,189 1,250       675,000 1,015    
Sale of stock, price per share $ 2.76               $ 1,000   $ 3.80 $ 3.70 $ 3.80     $ 3.80            
Proceeds from issuance of common stock and warrants, net $ 6,200,000 $ 10,958,231 $ 4,507,389 $ 106,253,011           $ 525,000.0     $ 4,500,000         $ 1,000,000        
Maximum equity commitment amount under agreement                                 15,000,000          
Equity commitment agreement period                                 36 months          
Aggregate purchase price of preferred shares     (1,618,509)       1,015,000                              
Number of shares converted in common stock               1,015                            
Preferred stock converted to common stock, shares           275,782                                
Aggregate purchase price on issuance of common stock to be received                   $ 2,497,500                        
Warrant to purchase common stock 0.75                                          
Common stock exercise price $ 3.25                                          
Reverse stock split   Company effected a 1 for 10 reverse stock split