Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Additional Information (Detail)

v3.10.0.1
Convertible Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jan. 31, 2018
Jun. 14, 2017
Sep. 21, 2015
Jun. 23, 2015
May 31, 2015
May 31, 2018
May 31, 2017
May 31, 2016
May 31, 2015
May 31, 2010
Mar. 23, 2018
Nov. 01, 2017
Aug. 24, 2017
Jul. 28, 2017
Jun. 19, 2017
Aug. 24, 2016
Mar. 18, 2016
Mar. 17, 2016
Feb. 06, 2015
Sep. 26, 2014
Apr. 30, 2010
Class of Stock [Line Items]                                          
Common stock, shares authorized           375,000,000 350,000,000         200,000,000 375,000,000     350,000,000 250,000,000 200,000,000     100,000,000
Common stock, par value           $ 0.001 $ 0.001                            
Sale of convertible notes           $ 4,888,500 $ 1,150,000                            
Amortization of discount on related party convertible notes               $ 94,344                          
Common stock warrants to purchase shares                     3,027,263                    
Loss on extinguishment of convertible notes               (584,177)                          
Change in fair value of derivative liability           1,690,935 2,164,533 646,505                          
Amortization of convertible notes           1,666,017   1,791,967                          
Convertible notes payable, net             1,058,611                            
Convertible notes, repayment of principal and interest           259,157   789,140                          
Commission expense               108,000                          
Amortization of debt issuance costs           435,609   604,625                          
Proceeds from sale of common stock and warrant           25,224,212 19,133,755 37,569,964                          
Short-Term Convertible Notes                                          
Class of Stock [Line Items]                                          
Amortization of convertible notes               1,784,000                          
Convertible notes payable, net               0                          
Alpha Venture Capital Partners, L.P.                                          
Class of Stock [Line Items]                                          
Common stock warrants to purchase shares                           33,333              
Exercise price of warrants, per share                           $ 1.00              
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                   $ 1,500,000 $ 2,000,000  
Common stock issued upon conversion of notes       1,000,000                                  
Conversion of Preferred Stock to Common Stock                                          
Class of Stock [Line Items]                                          
Undeclared dividend           199,000                              
Accrued dividend           $ 387,000                              
Common Stock                                          
Class of Stock [Line Items]                                          
Number of common shares issued upon conversion of preferred stock           10                              
Conversion price           $ 0.50                              
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               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%                        
AVCP Convertible Notes | 2-Year Unsecured Convertible Promissory Note | Alpha Venture Capital Partners, L.P.                                          
Class of Stock [Line Items]                                          
Convertible notes, interest rate         5.00%       5.00%                        
Convertible note maturity date                 Sep. 26, 2016                        
Common stock warrant term                 2 years                        
AVCP Convertible Notes | 2-Year Unsecured Convertible Promissory Note | Alpha Venture Capital Partners, L.P. | 3-Month Unsecured Convertible Promissory Note                                          
Class of Stock [Line Items]                                          
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 | 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       $ (584,177)                                  
Change in fair value of derivative liability       647,000                                  
Inducement interest       $ 758,000                                  
AVCP Convertible Notes | Previously Reported | Alpha Venture Capital Partners, L.P.                                          
Class of Stock [Line Items]                                          
Increase / Decrease in number of shares of common stock         3,500,000       3,500,000                        
Short-Term Convertible Notes                                          
Class of Stock [Line Items]                                          
Convertible note maturity date Jan. 31, 2018                                        
Common stock warrants to purchase shares 7,718,010                                        
Exercise price of warrants, per share $ 0.75                                        
Term of warrants 5 years                                        
Principal amount of notes converted               $ 525,000                          
Common stock issued upon conversion of notes               723,773                          
Inducement interest               $ 330,000                          
Aggregate original principal amount of Short-Term Convertible Notes $ 6,000,000   $ 2,700,000                                    
Accrued but unpaid interest               17,830                          
Convertible notes, repayment of principal and interest $ 259,000             789,000                          
Number of shares to be sold 12,062,728                                        
Sale of Stock, Price Per Share $ 0.50                                        
Proceeds from sale of common stock and warrant $ 6,000,000                                        
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]                                          
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       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%                                    
Short-Term Convertible Notes | Detachable Common Stock Warrants                                          
Class of Stock [Line Items]                                          
Amortization of convertible notes           $ 1,600,000 0 1,900,000                          
Debt discount           1,500,000 $ 92,000.0 $ 0.0                          
2017 Short Term Convertible Notes                                          
Class of Stock [Line Items]                                          
Conversion price             $ 0.75                            
Convertible notes, interest rate             7.00%                            
Convertible note maturity date             Jan. 31, 2018                            
Common stock warrants to purchase shares 7,718,010           383,333               383,333            
Exercise price of warrants, per share             $ 1.35                            
Term of warrants             5 years                            
Aggregate original principal amount of Short-Term Convertible Notes           4,890,000 $ 1,150,000                            
Convertible notes, repayment of principal and interest $ 259,000         $ 250,000                              
Debt discount             $ 92,000                            
Payment obligation against which common stock issued 5,788,500                                        
Accrued but unpaid interest $ 243,000                                        
Number of shares to be sold 12,062,728                                        
Sale of Stock, Price Per Share $ 0.50                                        
Proceeds from sale of common stock and warrant $ 6,000,000                                        
2017 Short Term Convertible Notes | Investor Warrants                                          
Class of Stock [Line Items]                                          
Common stock warrants to purchase shares           4,025,656 4,025,656                            
Exercise price of warrants, per share           $ 1.00 $ 1.00                            
Term of warrants           5 years 5 years                            
2017 Short Term Convertible Notes | Detachable Common Stock Warrants                                          
Class of Stock [Line Items]                                          
Amortization of convertible notes           $ 1,600,000 $ 0                            
Debt discount           1,500,000 $ 92,000.0                            
Unamortized issuance costs           400,000                              
Amortization of debt issuance costs           $ 400,000                              
2017 Short Term Convertible Notes | Minimum                                          
Class of Stock [Line Items]                                          
Exercise price of warrants, per share   $ 1.00                                      
Warrant covering common stock shares purchased, percentage   25.00%                                      
2017 Short Term Convertible Notes | Maximum                                          
Class of Stock [Line Items]                                          
Exercise price of warrants, per share   $ 1.35                                      
Warrant covering common stock shares purchased, percentage   50.00%                                      
Series B Convertible Preferred Stock                                          
Class of Stock [Line Items]                                          
Series B Convertible preferred stock, shares issued           92,100 92,100     400,000                      
Preferred Stock, Share issuance price                   $ 5.00                      
Cash proceeds                   $ 2,009,000                      
Series B Convertible preferred stock, shares outstanding           92,100 92,100                            
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