Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details Narrative)

v3.10.0.1
Stock-Based Compensation (Details Narrative) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2018
Oct. 29, 2018
Oct. 26, 2018
Oct. 23, 2018
Aug. 22, 2018
Oct. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
Number of shares authorized for issuance to awards granted 2,200,176         2,200,176 2,200,176    
Purchase price of incentive stock options as a percentage of its fair value             85.00%    
Number of stock options cancelled             1,538,541    
Options granted to purchase shares             568,500    
Term of stock options             1 year 5 months 12 days    
Exercise price             $ 1.53    
Intrinsic value of options outstanding $ 2,400,000         $ 2,400,000 $ 2,400,000    
Intrinsic value of options exercisable 1,600,000         1,600,000 1,600,000    
Unrecognized stock-based compensation expenses $ 2,800,000         $ 2,800,000 $ 2,800,000    
Weighted-average grant date fair value             $ 0.99 $ 0.67  
Number of shares issued for service 82,000                
Restricted Stock Units (RSUs) [Member]                  
Stock-based compensation expense recognized             $ 150,000 $ 100,000  
Options granted to purchase shares           50,000      
Exercise price           $ 1.64      
Number of granted shares vested   12,500 25,000     37,500      
Number of shares vesting percentage     25.00%            
Number of shares vesting, description     The Company's Board of Directors approved the accelerated vesting of 25% of the outstanding restricted stock units (RSUs) held by the employee. The RSUs, which originally vest on the third anniversary of the grant date, or March 29, 2020, were accelerated to vest on October 26, 2018.            
Modification of accrued expense on unvested stock units     $ 63,278            
Fair value of vested stock grants     $ 44,250            
Number of restricted stock outstanding 518,020         518,020 518,020    
Restricted Stock Units (RSUs) [Member] | October 29, 2019 [Member]                  
Number of granted shares vested           12,500      
Restricted Stock Units (RSUs) [Member] | October 29, 2020 [Member]                  
Number of granted shares vested           12,500      
Restricted Stock Units (RSUs) [Member] | October 29, 2021 [Member]                  
Number of granted shares vested           12,500      
Research And Development Expense [Member]                  
Stock-based compensation expense recognized             $ 738,000 200,000  
General And Administrative Expense [Member]                  
Stock-based compensation expense recognized             $ 527,000 $ 400,000  
Maximum [Member]                  
Maturity             6 years 6 months 6 years 6 months  
Minimum [Member]                  
Maturity             5 years 5 years  
Individual [Member] | Stock Option Cancellation Agreement [Member]                  
Number of vested stock options cancelled         300,000        
Number of restricted stock issued         175,000        
Stock-based compensation expense recognized         $ 135,425        
Two Consultants [Member] | Stock Option Cancellation Agreement [Member]                  
Stock-based compensation expense recognized       $ 377,278          
Number of stock options cancelled       535,000          
Employees [Member]                  
Options granted to purchase shares             200,000    
Term of stock options             10 years    
Vesting period             3 years    
Exercise price             $ 1.64    
Consultants [Member]                  
Stock-based compensation expense recognized             $ 239,824 $ 109,000  
Options granted to purchase shares             250,000    
Term of stock options             10 years    
Exercise price             $ 1.43    
Number of shares issued for service             184,000 100,000  
Number of shares issued for service, value             $ 251,560 $ 109,000  
Employees, Directors and Consultants [Member]                  
Stock-based compensation expense recognized             $ 1,300,000 $ 600,000  
2011 Plan [Member]                  
Number of shares authorized for issuance to awards granted 1,000,000         1,000,000 1,000,000    
Maximum shares granted per fiscal year per individual             8,500,000    
2011 Plan [Member] | Minimum [Member]                  
Purchase price of incentive stock options as a percentage of its fair value             100.00%    
Provisional percentage of outstanding stock owned by stockholders             10.00%    
Exercise price as a percentage of fair value of common stock             110.00%    
2011 Plan [Member] | Common Stock [Member] | Maximum [Member]                  
Maximum shares granted per fiscal year per individual             500,000    
Stock option exercisable period             10 years    
2011 Plan [Member] | Employee, Director and Consultants [Member]                  
Employee stock purchase program description             The 2011 Plan authorizes a total of 7,500,000 for issuance thereunder, and includes an automatic increase of the number of shares of common stock reserved thereunder on the first business day of each calendar year by the lesser of: (i) 3% of the shares of the Company's common stock outstanding as of the last day of the immediately preceding calendar year; (ii) 1,000,000 shares; or (iii) such lesser number of shares as determined by the Company's Board of Directors.    
Number of shares authorized for issuance to awards granted 7,500,000         7,500,000 7,500,000    
2011 Plan [Member] | Employees [Member]                  
Options granted to purchase shares             111,000 163,500  
Term of stock options             10 years 10 years  
Vesting period             3 years 3 years  
2011 Plan [Member] | Employees [Member] | Maximum [Member]                  
Exercise price             $ 1.58 $ 0.96  
2011 Plan [Member] | Employees [Member] | Minimum [Member]                  
Exercise price             $ 1.32 $ 0.92  
2011 Plan [Member] | Consultants [Member]                  
Options granted to purchase shares               50,000  
Term of stock options               10 years  
Exercise price               $ 1.00  
2011 Plan [Member] | Directors [Member]                  
Options granted to purchase shares               200,000  
Term of stock options               10 years  
Vesting period               1 year  
2011 Plan [Member] | Directors [Member] | Maximum [Member]                  
Exercise price               $ 1.08  
2011 Plan [Member] | Directors [Member] | Minimum [Member]                  
Exercise price               $ 0.979  
ESPP [Member]                  
Number of shares authorized for issuance to awards granted 410,903         410,903 410,903    
Purchase price of incentive stock options as a percentage of its fair value             85.00%    
Stock-based compensation expense recognized             $ 6,600 $ 7,000  
Stock issued during period, shares, employee stock purchase plans             500,000    
Discount from market price, offering date             15.00%    
Fair market value of unvested shares, percentage             15.00%    
ESPP [Member] | Black-Scholes Option Valuation Model [Member]                  
Maturity                 6 months
Risk free interest rate                 1.15%
Volatility rate                 62.60%
Forfeitures percentage                 0.00%
Dividend                 $ 0
ESPP [Member] | January 31, 2019 [Member] | Black-Scholes Option Valuation Model [Member]                  
Maturity             6 months    
Risk free interest rate             2.22%    
Volatility rate             61.83%    
Forfeitures percentage             0.00%    
Dividend             $ 0    
ESPP [Member] | July 31, 2016 [Member] | First Offering Period [Member]                  
Shares purchased             17,789    
ESPP [Member] | January 31, 2017 [Member] | Second Offering Period [Member]                  
Shares purchased             18,631    
ESPP [Member] | July 31, 2017 [Member] | Third Offering Period [Member]                  
Shares purchased             21,646    
ESPP [Member] | January 31, 2018 [Member] | Fourth Offering Period [Member]                  
Shares purchased             18,960    
ESPP [Member] | July 31, 2018 [Member] | Fifth Offering Period [Member]                  
Shares purchased             12,071