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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 116 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Aug. 10, 2012
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2012
Sep. 30, 2012
Oct. 21, 2011
Dec. 31, 2012
2000 Stock Option Plan [Member]
Dec. 31, 2012
2004 Equity Incentive Plan [Member]
Feb. 29, 2012
Series A Preferred Stock [Member]
Oct. 31, 2011
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Oct. 24, 2011
Series A Preferred Stock [Member]
Oct. 31, 2011
Common Stock [Member]
Dec. 31, 2012
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. 21, 2011
Common Stock [Member]
Sep. 30, 2012
Limited liability company [Member]
Oct. 31, 2011
Subscription Agreement [Member]
Oct. 31, 2011
Subscription Agreement [Member]
Series A Preferred Stock [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   15,644,158     15,644,158 13,579,185                                  
Preferred stock, shares outstanding   0     0 0                                  
Share reserve for issuance               2,369,960 2,369,960                            
Maximum equity commitment amount under agreement                                         $ 15,000,000    
Equity commitment agreement period                                         36 months    
Cash drawn from facility                                         1,000,000    
Issuance and sold of Common Stock 2,260,869                           1,825,079 15,511 8,656 225,189 1,250     675,000 1,015
Sale of stock, price per share $ 2.76                       $ 1,000   $ 2.26         $ 3.70      
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                           0.50                
Proceeds from issuance of common stock and warrants, net $ 6,200,000 $ 3,332,467 $ 1,463,833   $ 109,585,478                   $ 4,100,000                
Common stock exercise price $ 3.25                           $ 2.20                
Reverse stock split   Company effected a 1 for 10 reverse stock split