Stock-based Compensation Plans (Details 3) - $ / shares |
9 Months Ended | |
|---|---|---|
Nov. 30, 2018 |
Nov. 30, 2017 |
|
| Exercise price | $ 11.52 | |
| Risk-free interest rate | 2.82% | |
| Expected dividend yield | 0.00% | 0.00% |
| Expected volatility | 78.00% | |
| Expected life years | 6 years 6 months | |
| Minimum [Member] | ||
| Exercise price | $ 5.25 | |
| Risk-free interest rate | 1.46% | |
| Expected volatility | 80.00% | |
| Expected life years | 3 years | |
| Maximum [Member] | ||
| Exercise price | $ 13.89 | |
| Risk-free interest rate | 2.15% | |
| Expected volatility | 94.00% | |
| Expected life years | 6 years | |