Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Additional Information (Detail)

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Stock Options and Warrants - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 12, 2016
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
May 31, 2016
Feb. 12, 2017
Mar. 31, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Proceeds from exercise of warrants                 $ 397,880 $ 94,283        
Extended expiration date of warrants       May 30, 2017                    
Non-cash interest expense       $ 72,000                    
Compensation expense                 $ 984,772 1,546,383        
Placement Agent                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares 122,799   453,652 122,799 1,066,667   453,652   453,652          
Term of warrants 5 years   5 years 5 years 5 years                  
Exercise price of warrants, per share $ 0.825   $ 0.825 $ 0.825 $ 0.825   $ 0.825   $ 0.825          
Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares     774,097       774,097   774,097          
Term of warrants           5 years         5 years      
Exercise price of warrants, per share           $ 1.00                
Proceeds from exercise of warrants                 $ 398,000          
Private Equity Offering | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share                     $ 0.75      
Private Equity Offering | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share                     $ 1.00      
Private Equity Offering | Warrants                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares           182,375         23,254,230      
Exercise price of warrants, per share           $ 1.35                
Private Equity Offering | Investors and Placement Agent | Warrants                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares           182,375                
Private Equity Offering | Placement Agent                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares                     4,960,314      
Non Cash Exercise | Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares     138,864       138,864   138,864          
Warrants Determined to Extend Expiration Dates                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares 6,310,667     6,310,667                    
Exercise price of warrants, per share $ 1.00     $ 1.00                    
Extended expiration date of warrants       May 31, 2017                    
October Twenty Sixteen Warrants                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of warrants 2     2                    
Warrants exercisable period, closing month/year       2016-10                    
December Twenty Sixteen Warrants                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares 186,667     186,667                    
Number of warrants 1     1                    
Warrants exercisable period, closing month/year       2016-12                    
January Twenty Seventeen Warrants                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares 160,000     160,000                    
Number of warrants 2     2                    
Warrants exercisable period, closing date       Jan. 15, 2017                    
Exercise Price 1 | Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share           $ 1.35                
Exercise Price 2 | Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share     $ 0.50       $ 0.50   $ 0.50          
Exercise Price 3 | Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share     0.75       0.75   0.75          
Exercise Price 4 | Private Equity Offering                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Exercise price of warrants, per share     $ 0.75       $ 0.75   $ 0.75          
Securities Purchase Agreement                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Warrants to purchase common shares, shares 767,498 2,000,000 2,835,323 767,498 6,666,667   2,835,323   2,835,323          
Term of warrants 5 years 5 years 5 years 5 years 5 years                  
Exercise price of warrants, per share $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00   $ 1.00   $ 1.00          
Time Based Options                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, exercise price             $ 0.76              
Vesting period             2 years              
Stock options grant date fair value             $ 0.64              
Stock options, term             10 years              
Time Based Options | Executive Chairman                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, shares             550,000              
Milestone Options [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, shares             450,000              
2012 Equity Incentive Plan                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Compensation expense             $ 297,000 $ 955,000 $ 985,000 1,546,000        
Grant date fair value of options and warrants             231,000 $ 362,000 762,000 $ 686,000        
Unrecognized compensation expense     $ 1,156,000       $ 1,156,000   $ 1,156,000          
Weighted average period over which unrecognized compensation expense is expected to be recognized             1 year 10 months 24 days              
2012 Equity Incentive Plan | Stock Options                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares available for future stock-based grants     7,550,930       7,550,930   7,550,930          
2012 Equity Incentive Plan | Stock Options | Before Amendment                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares available for future issuance                       7,000,000 5,000,000 3,000,000
2012 Equity Incentive Plan | Stock Options | After amendment                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares available for future issuance                       15,000,000 7,000,000 5,000,000
2012 Equity Incentive Plan | Stock Options | Executive Management and Employees                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, shares                 1,050,000          
Vesting period                 3 years          
Stock options, term                 10 years          
Stock options granted, exercise price, lower range limit                 $ 1.09          
Stock options granted, exercise price, upper range limit                 1.10          
2012 Equity Incentive Plan | Stock Options | Executive Management and Employees | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options grant date fair value                 0.75          
2012 Equity Incentive Plan | Stock Options | Executive Management and Employees | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options grant date fair value                 $ 0.76          
2012 Equity Incentive Plan | Stock Options | Directors                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, shares                 300,000          
Stock options granted, exercise price                 $ 1.09          
Stock options grant date fair value                 $ 0.78          
2012 Equity Incentive Plan | Stock Options | Directors | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period                 1 year          
2012 Equity Incentive Plan | Stock Options | Directors | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period                 10 years          
2012 Equity Incentive Plan | Stock Options | Director 2                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted, shares                 100,000          
Stock options granted, exercise price                 $ 0.68          
Stock options grant date fair value                 $ 0.53          
Vesting rights percentage                 25.00%          
2012 Equity Incentive Plan | Stock Options | Director 2 | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options, term                 1 year          
2012 Equity Incentive Plan | Stock Options | Director 2 | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options, term                 10 years