Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Additional Information (Detail)

v3.7.0.1
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, 2017
May 31, 2016
May 31, 2015
May 31, 2010
Aug. 24, 2016
Mar. 18, 2016
Mar. 17, 2016
May 31, 2013
Apr. 30, 2010
Class of Stock [Line Items]                            
Common stock, shares authorized           350,000,000 250,000,000     350,000,000 250,000,000 200,000,000   100,000,000
Common stock, par value           $ 0.001 $ 0.001              
Convertible note, principal amount           $ 1,150,000                
Amortization of convertible notes             $ 1,791,967              
Sale of convertible notes           1,150,000                
Amortization of discount on related party convertible notes             94,344              
Loss on extinguishment of convertible notes             (584,177)              
Change in fair value of derivative liability           2,164,533 646,505              
Inducement interest             1,194,887              
Convertible notes payable, net           $ 1,058,611                
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                
2015 Short-Term Convertible Notes                            
Class of Stock [Line Items]                            
Amortization of convertible notes           $ 0 1,784,000              
Convertible notes payable, net           $ 0 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     $ 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     $ 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                
Amortization of convertible notes           $ 0 7,000              
Principal amount of notes converted           0 50,000              
Debt discount           0                
2013 Convertible Notes | Convertible Note at $0.75 per Share                            
Class of Stock [Line Items]                            
Conversion price                         $ 0.75  
Convertible note, principal amount           $ 0 $ 0           $ 6,208,250  
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 | Detachable Common Stock Warrants                            
Class of Stock [Line Items]                            
Common stock warrant term             2 years 2 years            
Common stock warrants to purchase shares         6,300,000   6,300,000 6,300,000            
Exercise price of warrants, per share         $ 1.00   $ 1.00 $ 1.00            
Common stock warrants, extended period             1 year 1 year            
Interest expense associated with extension of warrant expiration           $ 72,000 $ 867,000              
Common stock warrants, extended expiration date final             May 31, 2017              
Common stock warrants, Current expiration date           Jun. 30, 2017                
2013 Convertible Notes | Detachable Common Stock Warrants | Minimum                            
Class of Stock [Line Items]                            
Common stock warrants, Current expiration date             2015-10 2015-10            
Common stock warrants, extended expiration date             2016-10 2016-10            
2013 Convertible Notes | Detachable Common Stock Warrants | Maximum                            
Class of Stock [Line Items]                            
Common stock warrants, Current expiration date             2016-01 2016-01            
Common stock warrants, extended expiration date             2017-01 2017-01            
2013 Convertible Notes | Detachable Common Stock Warrants | Investor                            
Class of Stock [Line Items]                            
Common stock warrant term           2 years                
Common stock warrants to purchase 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                
AVCP Convertible Notes                            
Class of Stock [Line Items]                            
Change in fair value of derivative liability           $ 0 $ 647,000              
AVCP Convertible Notes | Alpha Venture Capital Partners, L.P.                            
Class of Stock [Line Items]                            
Conversion price         $ 0.675     $ 0.675            
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 discount on related party convertible notes           $ 0 94,000              
Principal amount of notes converted   $ 3,535,627                        
Common stock issued upon conversion of notes   5,237,966                        
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%            
Common stock warrant term               2 years            
Convertible note maturity date               Sep. 26, 2016            
AVCP Convertible Notes | Warrants Expire on December 31, 2019 | Alpha Venture Capital Partners, L.P.                            
Class of Stock [Line Items]                            
Common stock warrants to purchase shares       250,000                    
Exercise price of warrants, per share       $ 0.50                    
Warrants, expiration date           Dec. 31, 2019                
Term of warrants       5 years                    
AVCP Convertible Notes | Warrants Exercisable on February 28, 2020 | Alpha Venture Capital Partners, L.P.                            
Class of Stock [Line Items]                            
Common stock warrants to purchase shares     75,000                      
Exercise price of warrants, per share     $ 0.50                      
Warrants, expiration date           Feb. 29, 2020                
Term of warrants     5 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                        
Term of warrants   5 years                        
Common stock issued upon conversion of notes   1,000,000                        
Loss on extinguishment of convertible notes   $ (584,000)                        
Change in fair value of derivative liability   647,000                        
Inducement interest   $ 758,000                        
2015 Short-Term Convertible Notes                            
Class of Stock [Line Items]                            
Principal amount of notes converted           $ 0 $ 525,000              
Common stock issued upon conversion of notes             723,773              
Inducement interest             $ 330,000              
Aggregate original principal amount of Short-Term Convertible Notes $ 2,700,000                          
Accrued but unpaid interest             17,830              
Convertible notes, repayment of principal and interest             $ 789,000              
Debt discount           $ 0                
2015 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%                          
2015 Short-Term Convertible Notes | Investor Warrants | 6-Month Unsecured Convertible Promissory Notes                            
Class of Stock [Line Items]                            
Common stock warrants to purchase shares         1,061,586     1,061,586            
Exercise price of warrants, per share         $ 0.75     $ 0.75            
Term of warrants               5 years            
2015 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%                          
2017 Short Term Convertible Notes                            
Class of Stock [Line Items]                            
Conversion price           $ 0.75                
Convertible notes, interest rate           7.00%                
Common stock warrants to purchase shares           383,333                
Exercise price of warrants, per share           $ 1.35                
Convertible note maturity date           Jan. 31, 2018                
Term of warrants           5 years                
Aggregate original principal amount of Short-Term Convertible Notes           $ 1,150,000                
Debt discount           $ 92,000                
2017 Short Term Convertible Notes | Investor Warrants                            
Class of Stock [Line Items]                            
Common stock warrants to purchase shares           383,333                
Exercise price of warrants, per share           $ 1.35                
Term of warrants           5 years                
Series B Convertible Preferred Stock                            
Class of Stock [Line Items]                            
Series B Convertible preferred stock, shares issued           92,100 95,100   400,000          
Preferred Stock, Share issuance price                 $ 5.00          
Cash proceeds                 $ 2,009,000          
Series B Convertible preferred stock, shares outstanding           92,100 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