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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 119 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Jan. 31, 2013
Dec. 31, 2012
Aug. 10, 2012
Mar. 31, 2013
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2013
Sep. 30, 2012
Oct. 21, 2011
Mar. 31, 2013
2000 Stock Option Plan [Member]
Mar. 31, 2013
2004 Equity Incentive Plan [Member]
Feb. 29, 2012
Series A Preferred Stock [Member]
Oct. 31, 2011
Series A Preferred Stock [Member]
Mar. 31, 2013
Series A Preferred Stock [Member]
Oct. 24, 2011
Series A Preferred Stock [Member]
Oct. 31, 2011
Common Stock [Member]
Oct. 04, 2011
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Mar. 31, 2013
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]
Apr. 29, 2013
Subsequent Events [Member]
Apr. 29, 2013
Subsequent Events [Member]
Series B convertible preferred stock [Member]
Mar. 31, 2013
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     150,000,000                                              
Common stock, shares authorized       145,000,000 145,000,000     145,000,000 145,000,000                                            
Common stock, par value       $ 0.001 $ 0.001     $ 0.001 $ 0.001 $ 0.001                                          
Preferred stock, shares authorized       5,000,000 5,000,000     5,000,000 5,000,000                                            
Preferred stock, par value       $ 0.001 $ 0.001     $ 0.001 $ 0.001             $ 0.001                              
Common stock, shares outstanding       17,042,764 17,042,764     17,042,764 13,579,185                                            
Preferred stock, shares outstanding       0 0     0 0                                            
Share reserve for issuance                     3,369,960 3,369,960                                      
Issuance and sold of Common Stock     2,260,869                             138,158 1,458,917 1,825,079   15,511 8,656 225,189 1,250   14,262,553 9,900   675,000 1,015
Sale of stock, price per share     $ 2.76                         $ 1,000   $ 3.80 $ 3.80 $ 2.26     $ 3.80     $ 3.70 $ 1.83 $ 1,000.00      
Proceeds from issuance of common stock and warrants, net     $ 6,200,000   $ 7,089,327 $ 2,696,333   $ 113,342,338                   $ 525,000.0   $ 4,100,000     $ 4,500,000       $ 35,350,000        
Subscription receivable                 1,016,000                   1,000,000       1,000,000                
Maximum equity commitment amount under agreement                                                         15,000,000    
Equity commitment agreement period                                                         36 months    
Cash drawn from facility                                                         1,000,000    
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                   36,000,472        
Warrant to purchase common stock     0.75                                 0.50                      
Common stock exercise price     $ 3.25                                   $ 2.12                    
Shares issued under public offering 1,667,051 1,800,000   1,170,000                                                      
Shares issued under public offering, price per share $ 2.12 $ 2.26                                                          
Unit sold, description Each unit consisted of one share of common stock and a warrant to purchase Each unit consisted of one share of Common Stock and a warrant to purchase                                                          
Warrant to purchase share of Common Stock 0.5 0.5                                                          
Exercise price of warrant       2.14 2.14     2.14                                              
Gross proceeds from offering $ 3,300,000 $ 3,900,000   $ 1,200,000 $ 7,200,000                                                    
Conversion price                                                     $ 1.83