Stockholders' Equity (Tables)
 12 Months Ended
Feb. 28, 2018
Stockholders Equity Tables  
Estimated fair value of warrants on grant date
Risk-free interest rate 2.10%
Expected dividend yield 0%
Expected volatility 80%

Expected life

 6 years

 

Risk-free interest rate 1.46 to 1.74%
Expected dividend yield 0%
Expected volatility 82 to 94%
Expected life 3 to 5 years

 

Risk-free interest rate 1.50 to 2.15%
Expected dividend yield 0%
Expected volatility 80 to 94%
Expected life 3 to 6 years
Warrants activities

    Number of Warrant Shares     Weighted Average Exercise Price  
Balance, February 29, 2016     2,322,334     $ 1.03  
Granted     712,670     $ 5.68  
Forfeited     (1,037,500 )   $ 0.80  
Exercised     (247,500 )   $ 0.80  
Expired     (102,334 )   $ 6.00  
Balance, February 28, 2017     1,647,670     $ 2.91  
Granted     2,481,917     $ 9.43  
Forfeited     (620,385 )   $ 4.97  
Exercised     (470,054 )   $ 3.69  
Expired     (523,900 )   $ 5.21  
Balance, February 28, 2018     2,515,248     $ 8.21  
Earned and exercisable, February 28, 2018     981,916     $ 7.13  
Unvested, February 28, 2018     1,533,332     $ 8.90  
Outstanding and exercisable warrants
      Warrants Outstanding     Warrants Exercisable  
Exercise Price     Number Outstanding     Average Remaining Contractual Life (in years)     Number Exercisable     Average Remaining Contractual Life (in years)  
$ 0.80       602,081       7.75       389,581       7.75  
$ 3.00       12,500       0.25       12,500       0.25  
$ 5.25       530,000       9.49       72,500       9.49  
$ 12.00       840,667       8.09       382,335       6.35  
$ 13.49       250,000       9.63       125,000       9.63  
$ 13.89       280,000       9.69       -       -  
          2,515,248               981,916