Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments - Additional Information (Detail)

v3.3.1.900
Convertible Instruments - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 21, 2015
Jun. 23, 2015
Feb. 06, 2015
Sep. 26, 2014
Feb. 29, 2016
May. 31, 2015
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
May. 31, 2010
May. 31, 2013
Apr. 30, 2010
Class of Stock [Line Items]                          
Common stock, shares authorized         200,000,000 200,000,000   200,000,000   200,000,000     100,000,000
Common stock, par value         $ 0.001 $ 0.001   $ 0.001   $ 0.001      
Warrants to purchase common shares, shares         133,734     133,734          
Exercise price of warrants, per share         $ 0.75     $ 0.75          
Amortization expense               $ 7,000 $ 1,299,000        
Proceeds from exercise of warrants               94,283 1,066,436        
Interest expense associated with extension of warrant expiration               866,713          
Sale of convertible notes                 3,500,000        
Loss on extinguishment of convertible notes               (584,177)          
Change in fair value of derivative liability             $ 1,261,545 646,505 455,970        
Inducement interest             202,295 2,061,600 555,628        
Amortization of discount on convertible notes             254,485 1,791,967 1,298,825        
Convertible notes, repayment of principal and interest               789,140          
Commission expense               $ 108,000          
Common Stock                          
Class of Stock [Line Items]                          
Number of common shares issued upon conversion of preferred stock         10     10          
Conversion price         $ 0.50     $ 0.50          
Short-Term Convertible Notes                          
Class of Stock [Line Items]                          
Amortization of discount on convertible notes               $ 1,784,000          
2013 Convertible Notes                          
Class of Stock [Line Items]                          
Convertible note, face amount                       $ 6,588,250  
Convertible note maturity start date               Nov. 30, 2013          
Convertible note maturity end date               Mar. 06, 2016          
Principal amount of notes converted               $ 50,000   $ 4,221,250      
Accrued but unpaid interest               $ 1,322          
Common stock issued upon conversion of notes               68,428          
2013 Convertible Notes | Convertible Note at $0.75 per Share                          
Class of Stock [Line Items]                          
Conversion price           $ 0.75       $ 0.75   $ 0.75  
Convertible note, principal amount         $ 0 $ 50,000   $ 0   $ 50,000   $ 6,208,250  
Convertible notes, interest rate           5.00%       5.00%      
Convertible note maturity date               Oct. 15, 2015          
2013 Convertible Notes | Convertible Note at $0.65 per Share                          
Class of Stock [Line Items]                          
Conversion price                       $ 0.65  
Convertible note, principal amount                       $ 380,000  
2013 Convertible Notes | Minimum                          
Class of Stock [Line Items]                          
Convertible notes, interest rate                       5.00%  
2013 Convertible Notes | Maximum                          
Class of Stock [Line Items]                          
Convertible notes, interest rate                       10.00%  
2013 Convertible Notes | Investor                          
Class of Stock [Line Items]                          
Interest on convertible notes payment start date               Apr. 01, 2013          
2013 Convertible Notes | Convertible Note at $0.75 per Share                          
Class of Stock [Line Items]                          
Conversion price           $ 0.75       $ 0.75      
Principal amount of notes converted                   $ 1,175,000      
Accrued but unpaid interest                   $ 4,703      
Common stock issued upon conversion of notes                   1,556,667      
Payments on convertible notes payable                   $ 3,793      
2013 Convertible Notes | Convertible Note at $0.75 per Share | Convertible Note at $0.55 per Share                          
Class of Stock [Line Items]                          
Common stock issued upon conversion of notes                   1,413,333      
Proceeds from exercise of warrants                   $ 777,333      
2013 Convertible Notes | Convertible Note at $0.65 per Share                          
Class of Stock [Line Items]                          
Conversion price           0.75       $ 0.75      
Principal amount of notes converted                   $ 3,046,250      
Accrued but unpaid interest                   $ 86,296      
Common stock issued upon conversion of notes                   4,181,079      
2013 Convertible Notes | Detachable Common Stock Warrants                          
Class of Stock [Line Items]                          
Common stock warrant term               2 years          
Warrants to purchase common shares, shares         6,300,000     6,300,000          
Exercise price of warrants, per share         $ 1.00     $ 1.00          
Common stock warrants, extended period               1 year          
Warrants, exercisable date               Oct. 01, 2015          
Interest expense associated with extension of warrant expiration               $ 866,700          
2013 Convertible Notes | Detachable Common Stock Warrants | Minimum                          
Class of Stock [Line Items]                          
Common stock warrants, Current expiration date               2015-10          
Common stock warrants, extended expiration date               2016-10          
2013 Convertible Notes | Detachable Common Stock Warrants | Maximum                          
Class of Stock [Line Items]                          
Common stock warrants, Current expiration date               2016-01          
Common stock warrants, extended expiration date               2017-01          
2013 Convertible Notes | Detachable Common Stock Warrants | Investor                          
Class of Stock [Line Items]                          
Common stock warrant term               2 years          
Warrants to purchase common shares, shares         8,527,984     8,527,984          
2013 Convertible Notes | Detachable Common Stock Warrants | Investor | Minimum                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share         $ 0.75     $ 0.75          
2013 Convertible Notes | Detachable Common Stock Warrants | Investor | Maximum                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share         $ 2.00     $ 2.00          
2013 Convertible Notes | Detachable Common Stock Warrants | Convertible Note at $0.75 per Share                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share           0.55       $ 0.55      
2013 Convertible Notes | Detachable Common Stock Warrants | Convertible Note at $0.75 per Share | Previously Reported                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share           2.00       2.00      
2013 Convertible Notes | Detachable Common Stock Warrants | Convertible Note at $0.65 per Share                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share           $ 1.00       $ 1.00      
Warrants to purchase shares of common stock           6,310,677       6,310,677      
Term of warrants                   7 months      
AVCP Convertible Notes                          
Class of Stock [Line Items]                          
Change in fair value of derivative liability         $ 0   $ 1,262,000 $ 647,000 $ 456,000        
AVCP Convertible Notes | Alpha Venture Capital Partners, L.P.                          
Class of Stock [Line Items]                          
Conversion price           $ 0.675       $ 0.675      
Principal amount of notes converted   $ 3,535,627                      
Common stock issued upon conversion of notes   5,237,966                      
Sale of convertible notes           $ 4,000,000              
Percentage of weighted average price per share           90.00%              
Weighted average price of deemed issued shares           $ 0.75       $ 0.75      
Increase / Decrease in number of shares of common stock           5,185,185       5,185,185      
AVCP Convertible Notes | Alpha Venture Capital Partners, L.P. | 3-Month Unsecured Convertible Promissory Note                          
Class of Stock [Line Items]                          
Preferred Stock, Share issuance price           $ 0.9444       $ 0.9444      
Conversion price           $ 1.00       $ 1.00      
Convertible note, face amount           $ 1,500,000       $ 1,500,000      
Convertible notes, interest rate           1.20%       1.20%      
Convertible note maturity date               May 05, 2015          
Additional convertible promissory notes that may be issued           $ 6,000,000       $ 6,000,000      
Percentage reduction to conversion price                   10.00%      
Convertible note, conversion price description               The conversion price was subject to (i) adjustment for stock splits and similar corporate events and (ii) reduction to a price per share that is 10% below the lowest sale price that is below $.9444 per share, for shares of common stock sold or deemed sold in future securities offerings, including sales to AVCP and its designees subject to certain exempt transactions.          
AVCP Convertible Notes | Alpha Venture Capital Partners, L.P. | Previously Reported                          
Class of Stock [Line Items]                          
Increase / Decrease in number of shares of common stock           3,500,000       3,500,000      
AVCP Convertible Notes | 2-Year Unsecured Convertible Promissory Note | Alpha Venture Capital Partners, L.P.                          
Class of Stock [Line Items]                          
Conversion price           $ 1.00       $ 1.00      
Convertible note, face amount           $ 2,000,000       $ 2,000,000      
Convertible notes, interest rate           5.00%       5.00%      
Convertible note maturity date                   Sep. 26, 2016      
Common stock warrant term                   2 years      
AVCP Convertible Notes | Additional 5-year Warrant | Alpha Venture Capital Partners, L.P.                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share   $ 0.675                      
Common stock issued upon conversion of notes   1,000,000                      
Term of warrants   5 years                      
Loss on extinguishment of convertible notes   $ (584,177)                      
Change in fair value of derivative liability   646,505                      
Inducement interest   $ 757,611                      
AVCP Convertible Notes | Warrants Expire on December 31, 2019 | Alpha Venture Capital Partners, L.P.                          
Class of Stock [Line Items]                          
Warrants to purchase common shares, shares       250,000                  
Exercise price of warrants, per share       $ 0.50                  
Term of warrants       5 years                  
Warrants, expiration date               Dec. 31, 2019          
AVCP Convertible Notes | Warrants Exercisable on February 28, 2020 | Alpha Venture Capital Partners, L.P.                          
Class of Stock [Line Items]                          
Warrants to purchase common shares, shares     75,000                    
Exercise price of warrants, per share     $ 0.50                    
Term of warrants     5 years                    
Warrants, expiration date               Feb. 29, 2020          
Short-Term Convertible Notes                          
Class of Stock [Line Items]                          
Principal amount of notes converted               $ 525,000          
Accrued but unpaid interest               $ 17,830          
Common stock issued upon conversion of notes               723,773          
Payments on convertible notes payable               $ 762,250          
Inducement interest               330,000          
Aggregate original principal amount of Short-Term Convertible Notes $ 2,700,000                        
Convertible notes, repayment of principal and interest               $ 789,000          
Short-Term Convertible Notes | 6-Month Unsecured Convertible Promissory Notes                          
Class of Stock [Line Items]                          
Conversion price $ 0.675         $ 0.75       $ 0.75      
Convertible notes, interest rate           7.00%       7.00%      
Proceeds from issuance of debt                   $ 4,000,000      
Debt Instrument, Term                   6 months      
Conversion price, discount rate 10.00%                        
Short-Term Convertible Notes | Investor Warrants | 6-Month Unsecured Convertible Promissory Notes                          
Class of Stock [Line Items]                          
Warrants to purchase common shares, shares           1,061,586       1,061,586      
Exercise price of warrants, per share           $ 0.75       $ 0.75      
Term of warrants                   5 years      
Short-Term Convertible Notes | Common Stock Warrants                          
Class of Stock [Line Items]                          
Exercise price of warrants, per share $ 0.675                        
Exercise price of warrants, per share, discount rate 10.00%                        
Series B Convertible Preferred Stock                          
Class of Stock [Line Items]                          
Series B Convertible preferred stock, shares issued         95,100 95,100   95,100   95,100 400,000    
Preferred Stock, Share issuance price                     $ 5.00    
Cash proceeds                     $ 2,009,000    
Series B Convertible preferred stock, shares outstanding         95,100 95,100   95,100   95,100      
Constructive dividend to Preferred stock holders               $ 6,000,000          
Liquidation preference on common shares         $ 5.00     $ 5.00          
Dividends are payable to preferred stock holders               0.25          
Convertible preferred stock, par value         $ 0.001 $ 0.001   $ 0.001   $ 0.001 $ 0.001    
Common stock, par value                     $ 0.001