Quarterly report pursuant to sections 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v2.4.0.8
Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 18, 2013
Mar. 31, 2014
Restricted Stock
Mar. 31, 2014
Research and Development Expense
Mar. 31, 2014
Research and Development Expense
Mar. 31, 2014
General and Administrative Expense
Mar. 31, 2014
General and Administrative Expense
Mar. 31, 2014
General and Administrative Expense
Restricted Stock
Mar. 31, 2014
Maximum
Mar. 31, 2014
Maximum
Mar. 31, 2014
Minimum
Mar. 31, 2014
Minimum
Mar. 24, 2014
Consultants
Restricted Stock
Mar. 31, 2014
Employees
Maximum
Mar. 31, 2014
Employees
Minimum
Mar. 31, 2014
2013 Stock Incentive Plan
Oct. 02, 2013
2013 Stock Incentive Plan
Jun. 18, 2013
2013 Stock Incentive Plan
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Maximum
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Maximum
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Minimum
Mar. 31, 2014
2013 Stock Incentive Plan
Consultants
Minimum
Mar. 31, 2014
2013 Stock Incentive Plan
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                      
common stock, shares, issued 72,076,487 72,076,487 60,145,237                       300,000         7,825,388              
Increase in aggregate number of shares       3,000,000                             2,405,809                
Percentage of outstanding number of shares       4.00%                                              
Share-based compensation arrangement by share-based payment award, options, grants in period, gross   4,869,212                                     2,754,212 220,000         1,895,000
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term   5 years 8 months 1 day                                         10 years   3 years    
Share-based compensation arrangement by share-based payment award, award vesting period                                           3 years 3 years   1 year    
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price   $ 0.35                           $ 0.37 $ 0.35             $ 0.20   $ 0.19  
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, minimum 86.00% 86.00%                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, maximum 115.00% 115.00%                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, minimum 0.91% 0.91%                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, maximum 2.77% 2.77%                                                  
Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate 0.00% 0.00%                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate 0.00% 0.00%                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term                     10 years 10 years 3 years 3 years                          
Share-based compensation arrangement by share-based payment award, number of shares available for grant                                   2,361,895                  
Allocated share-based compensation expense $ 371,792 $ 503,355       $ 263,009 $ 349,008 $ 108,783 $ 154,347 $ 51,750                                  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total         $ 51,750                         $ 1,576,053                  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition   2 years 3 months 22 days     8 months 1 day                                            
Common Stock, Shares Authorized 300,000,000 300,000,000 300,000,000                               10,231,197                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares   2,119,803     150,000