Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Additional Information (Detail)

v3.20.1
Stock Options and Warrants - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 01, 2020
Mar. 01, 2020
Feb. 21, 2020
Jan. 18, 2020
Dec. 23, 2019
Dec. 19, 2019
Dec. 13, 2019
Dec. 09, 2019
Dec. 06, 2019
Oct. 07, 2019
Sep. 12, 2019
Jan. 31, 2020
Feb. 29, 2020
Feb. 28, 2019
Nov. 30, 2019
Feb. 29, 2020
Feb. 28, 2019
May 22, 2019
Aug. 24, 2017
Mar. 31, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares     265,000 296,986   7,300,000                              
Stock option vested, Shares 25.000 11.986                                      
Vesting period     3 years 3 years                                  
Stock options, term     10 years 10 years           10 years 10 years                    
Warrants to purchase common shares, shares                             200,000            
Exercise price of warrants, per share                             $ 0.45            
Proceeds from Issuance of Common Stock                 $ 30.023                        
Compensation expense                               $ 4,345,508 $ 2,891,548        
Stock options grant date fair value     $ 191.000 $ 174.527                                  
Stock option granted, exercise price     $ 1.10                                    
2019 Short-term convertible notes                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares                         4,750,000     4,750,000          
Term of warrants                         5 years     5 years          
Tranche One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares       250,000                                  
Stock option vested, Shares     115.000                                    
Tranche Two                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares     150.000                                    
Minimum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exercise price       $ 0.85                                  
Minimum | 2019 Short-term convertible notes                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                         $ 0.30     $ 0.30          
Maximum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exercise price       $ 1.05                                  
Maximum | 2019 Short-term convertible notes                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                         $ 0.45     $ 0.45          
Placement Agent                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares                             655,305            
Term of warrants                             5 years            
Placement Agent | Minimum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                             $ 0.40            
Placement Agent | Maximum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                             $ 0.444            
Consultant                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares                 250,000                        
Term of warrants                 5 years                        
Exercise price of warrants, per share                 $ 0.32                        
Directors And Officers [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exerices price           $ 0.63                              
Stock options, term           10 years                              
Warrants to purchase common shares, shares           2,000,000                              
Exercise price of warrants, per share           $ 0.63                              
Stock options grant date fair value           $ 2,700,000                              
Directors And Officers [Member] | Tranche One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares           6,050,000                              
Directors And Officers [Member] | Tranche Two                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares           1,250,000                              
Investor | Series C Convertible Preferred Stock [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares                             9,601,000            
Term of warrants                             5 years            
Investor | Minimum | Series C Convertible Preferred Stock [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                             $ 0.30            
Investor | Maximum | Series C Convertible Preferred Stock [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Exercise price of warrants, per share                             $ 0.50            
Subscription Agreements                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares             1,825,000 1,926,248 1,037,500     3,785,000     11,987,250            
Term of warrants             5 years 5 years 5 years                        
Exercise price of warrants, per share             $ 0.45 $ 0.45 $ 0.30     $ 1.00     $ 0.45            
Proceeds from Issuance of Common Stock                 $ 360,000     $ 7,600,000                  
Purchase price, per share             $ 0.30 $ 0.30 $ 1,000.00     $ 1,000.00                  
Number of shares to be sold             2,433,333 2,568,330                          
Definitive Subscription Agreement                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares         7,377,049                                
Exercise price of warrants, per share         $ 0.305                                
Number of shares to be sold         14,754,098                                
Sale of Stock, Description of Transaction         Each share of common stock was sold together with one-half of one warrant to purchase one share of common stock                                
2012 Equity Incentive Plan                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Compensation expense                         $ 3,300,000 $ 1,400,000   $ 4,300,000 600,000        
Grant date fair value of options and warrants                         1,900,000 $ 2,800,000   700,000 $ 1,800,000        
Unrecognized compensation expense                         $ 1,700,000     $ 1,700,000          
2012 Equity Incentive Plan | Consultant                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares                             400.000            
2012 Equity Incentive Plan | Consultant | Tranche One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares                             200.000            
2012 Equity Incentive Plan | Consultant | Tranche Two                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares                             100.000            
2012 Equity Incentive Plan | Consultant | Tranche Three                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares                             100.000            
2012 Equity Incentive Plan | Directors Executives And Consultant [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares           7,100,000                 1,387,500            
2012 Equity Incentive Plan | Employee Stock Option One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exerices price                             $ 0.90            
2012 Equity Incentive Plan | Employee Stock Option One | Range One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares                             1,975,000            
Stock option granted, exerices price                             $ 0.385            
2012 Equity Incentive Plan | Employee Stock Option One | Range Two                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exerices price                             $ 0.52            
2012 Equity Incentive Plan | Employee Stock Option One | Director                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option vested, Shares                             1,000,000            
2012 Equity Incentive Plan | Employee Stock Option One | Director | Tranche One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting period                             1 year            
Stock options, term                             10 years            
2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Range One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock options grant date fair value                             $ 413.774            
2012 Equity Incentive Plan | Stock Options                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Shares available for future stock-based grants                         1,578,883     1,578,883          
2012 Equity Incentive Plan | Stock Options | Before 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 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                                   25,000,000 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]                                          
Warrants to purchase common shares, shares                             50,000            
2012 Equity Incentive Plan | Stock Options | Executive Management, Employee and Consultant                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares                             1,787,500            
Stock options grant date fair value                             $ 331.317            
2012 Equity Incentive Plan | Stock Options | Executive Management, Employee and Consultant | Tranche One                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Warrants to purchase common shares, shares                             1,112,500            
2012 Equity Incentive Plan | Stock Options | Executive Management, Employee and Consultant | Minimum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exerices price                             $ 0.30            
2012 Equity Incentive Plan | Stock Options | Executive Management, Employee and Consultant | Maximum                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, exerices price                             $ 0.52            
Outside 2012 Stock Incentive Plan | Directors Executives And Consultant [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Stock option granted, Shares                             400,000            
Phoenixus AG [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Minority interest amount         $ 4,000,000                                
Phoenixus AG [Member] | Definitive Subscription Agreement                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Minority interest amount         4,000,000                                
Related party Entity [Member] | Definitive Subscription Agreement                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Minority interest amount         $ 500,000