Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Additional Information (Detail)

v3.5.0.2
Convertible Instruments - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 21, 2015
Jun. 23, 2015
Feb. 06, 2015
Sep. 26, 2014
May 31, 2015
May 31, 2016
May 31, 2015
May 31, 2010
May 31, 2013
Apr. 30, 2010
Class of Stock [Line Items]                    
Common stock, shares authorized         100,000,000 250,000,000 100,000,000     100,000,000
Common stock, par value         $ 0.001 $ 0.001 $ 0.001      
Warrants to purchase common shares, shares           795,593        
Amortization expense           $ 7,000 $ 1,926,000      
Proceeds from exercise of warrants           548,619 1,141,435      
Sale of convertible notes             7,481,050      
Amortization of convertible notes           1,791,967 2,145,010      
Loss on extinguishment of convertible notes           (584,177)        
Change in fair value of derivative liability           646,505 (838,643)      
Inducement interest           2,061,600 1,526,254      
Convertible notes payable, net         $ 1,634,458   1,634,458      
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        
Conversion price           $ 0.50        
Short-Term Convertible Notes                    
Class of Stock [Line Items]                    
Amortization of convertible notes           $ 1,784,000 219,000      
Convertible notes payable, net           $ 0        
Alpha Venture Capital Partners, L.P. | 3-Month Unsecured Convertible Promissory Note                    
Class of Stock [Line Items]                    
Convertible note, face amount         1,500,000   1,500,000      
2-Year Unsecured Convertible Promissory Note | Alpha Venture Capital Partners, L.P.                    
Class of Stock [Line Items]                    
Convertible note, face amount         $ 2,000,000   2,000,000      
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         $ 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        
Exercise price of warrants, per share           $ 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        
2013 Convertible Notes | Detachable Common Stock Warrants | Investor | Minimum                    
Class of Stock [Line Items]                    
Exercise price of warrants, per share           $ 0.75        
2013 Convertible Notes | Detachable Common Stock Warrants | Investor | Maximum                    
Class of Stock [Line Items]                    
Exercise price of warrants, per share           $ 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           $ 647,000 $ 839,000      
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      
Amortization of convertible notes           $ 94,000 $ 524,000      
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 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 notes, interest rate         5.00%   5.00%      
Convertible note maturity date             Sep. 26, 2016      
Common stock warrant term             2 years      
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        
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   647,000                
Inducement interest   $ 758,000                
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 95,100 400,000    
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      
Constructive dividend to Preferred stock holders           $ 6,000,000        
Liquidation preference on common shares           $ 5.00        
Dividends are payable to preferred stock holders           0.25        
Convertible preferred stock, par value         $ 0.001 $ 0.001 $ 0.001 $ 0.001    
Common stock, par value               $ 0.001