Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Additional Information (Detail)

v3.20.2
Stock Options and Warrants - Additional Information (Detail) - USD ($)
3 Months Ended
Sep. 30, 2020
Aug. 31, 2020
Aug. 31, 2020
Aug. 31, 2019
Jun. 29, 2020
Jun. 16, 2020
May 31, 2020
Nov. 30, 2019
May 22, 2019
Aug. 24, 2017
Mar. 31, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Exercise price of warrants, per share               $ 0.45        
Common Stock issued   570,325,000 570,325,000   4,000,000   519,261,000          
Compensation expense     $ 3,692,000 $ 581,000                
Consultant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Warrants to purchase common shares, shares           105,000            
Term of warrants           5 years            
Exercise price of warrants, per share           $ 3.07            
Warrants grant date fair value           $ 2.11            
Warrants [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Warrants to purchase common shares, shares   27,927,669 27,927,669                  
Common Stock issued   28,657,889 28,657,889                  
Proceeds from Issuance of Common Stock     $ 13,500,000                  
Warrants [Member] | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Exercise price of warrants, per share   $ 0.30 $ 0.30                  
Warrants [Member] | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Exercise price of warrants, per share       $ 1.35                
2012 Equity Incentive Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Compensation expense     $ 2,000,000.0 $ 600,000                
Grant date fair value of options and warrants     4,400,000 $ 500,000                
Unrecognized compensation expense   $ 4,800,000 $ 4,800,000                  
Weighted average period over which unrecognized compensation expense is expected to be recognized     97 years                  
2012 Equity Incentive Plan | Subsequent event                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares available for future issuance 50,000,000                      
2012 Equity Incentive Plan | After Amendment                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares available for future issuance   25,000,000 25,000,000                  
2012 Equity Incentive Plan | Employee Stock Option One                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, Shares     100,000                  
Common Stock issued   100,000 100,000                  
Proceeds from Issuance of Common Stock     $ 39,000                  
2012 Equity Incentive Plan | Employee Stock Option One | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, exerices price     $ 0.39                  
2012 Equity Incentive Plan | Employee Stock Option One | Director | Range One                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, Shares     225,000                  
Stock option granted, exerices price     $ 6.15                  
2012 Equity Incentive Plan | Employee Stock Option One | Employees And Advisors | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock options grant date fair value     2.23                  
2012 Equity Incentive Plan | Employee Stock Option One | Employees And Advisors | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock options grant date fair value     4.23                  
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     $ 4.46                  
2012 Equity Incentive Plan | Stock Options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares available for future stock-based grants   261,854 261,854                  
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 25,000,000           25,000,000 15,000,000 7,000,000 5,000,000
2012 Equity Incentive Plan | Stock Options | Employees And Advisors                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, Shares     1,165,000                  
2012 Equity Incentive Plan | Stock Options | Employees And Advisors | Range One                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, exerices price     $ 2.75                  
2012 Equity Incentive Plan | Stock Options | Employees And Advisors | Range Two                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, exerices price     $ 6.15                  
2012 Incentive Plan Amended And Restated                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage Of Increase In Shares Issued On Proportion Of Outstanding Capital Stock On Last Day Of Each Fiscal Year   1.00%                    
2012 Incentive Plan Amended And Restated | Subsequent event                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares available for future issuance 50,000,000                      
Percentage Of Increase In Shares Issued On Proportion Of Outstanding Capital Stock On Last Day Of Each Fiscal Year 1.00%                      
2012 Incentive Plan Amended And Restated | Stock Options | Director | Subsequent event                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock option granted, Shares 506,250                      
Stock option granted, exerices price $ 6.15