Annual report pursuant to section 13 and 15(d)

Stock-Based Compensation - Additional Information (Detail)

v2.4.0.8
Stock-Based Compensation - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 18, 2013
Sep. 30, 2013
Research and Development Expense
Sep. 30, 2013
General and Administrative Expense
Sep. 30, 2013
Maximum
Sep. 30, 2013
Minimum
Sep. 30, 2013
Employees And Directors
Sep. 30, 2013
Consultants
Sep. 30, 2013
Employees
Sep. 30, 2013
Employees
Maximum
Sep. 30, 2013
Employees
Minimum
Sep. 30, 2013
Director
Sep. 30, 2013
2013 Stock Incentive Plan
Jun. 18, 2013
2013 Stock Incentive Plan
Sep. 30, 2013
2013 Stock Incentive Plan
Consultants
Sep. 30, 2009
2009 Stock Incentive Plan
Sep. 30, 2013
2009 Stock Incentive Plan
Consultants
Sep. 30, 2013
2009 Stock Incentive Plan
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
common stock, shares, issued 60,145,237 5,645,212                         7,825,388   707,460    
Increase in aggregate number of shares     3,000,000                                
Percentage Of Outstanding Number Of Shares     4.00%                                
Stock issued during period, shares, new issues               1,900,000 1,100,000                    
Common stock shares subject to vesting issued                                     579,026
Additional common stock shares subject to vesting issued                                   116,973  
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 3,000,000                 1,400,000     500,000     1,100,000      
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term 4 years 10 months 17 days 0 years                 10 years 4 years 6 months 4 years 6 months     3 years      
Share-based compensation arrangement by share-based payment award, award vesting period                         3 years     3 years      
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price $ 0.38                   $ 0.40 $ 0.37 $ 0.37     $ 0.40      
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, minimum 76.57%                                    
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, maximum 111.88%                                    
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, minimum 0.88%                                    
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, maximum 2.40%                                    
Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate 0.00%                                    
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate 0.00%                                    
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term           5 years 9 months 3 years                        
Share-based compensation arrangement by share-based payment award, number of shares available for grant 4,825,388                                    
Allocated share-based compensation expense $ 288,000     $ 38,000 $ 250,000                            
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total                           $ 996,000          
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 2 years 9 months 11 days