Stock-based Compensation Plans (Details 1) - shares
|
3 Months Ended |
|
|
May 31, 2018 |
May 31, 2017 |
Feb. 28, 2018 |
Feb. 28, 2017 |
| Number of warrants outstanding |
2,395,248
|
1,860,455
|
2,515,248
|
1,647,670
|
| Warrants exercisable |
1,066,916
|
836,705
|
|
|
| Warrants outstanding, weighted average remaining life |
8 years 1 month 16 days
|
3 years 3 months 4 days
|
|
|
| Warrant exercisable, weighted average remaining life |
6 years 11 months 23 days
|
4 months 6 days
|
|
|
| Exercise Prices 0.80 [Member] |
|
|
|
|
| Number of warrants outstanding |
582,081
|
912,452
|
|
|
| Warrants outstanding, weighted average remaining life |
7 years 6 months
|
6 months 3 days
|
|
|
| Exercise Prices 3.00 [Member] |
|
|
|
|
| Number of warrants outstanding |
12,500
|
75,000
|
|
|
| Warrants outstanding, weighted average remaining life |
0 years
|
1 year 7 days
|
|
|
| Exercise Prices 5.25 [Member] |
|
|
|
|
| Number of warrants outstanding |
430,000
|
550,000
|
|
|
| Warrants outstanding, weighted average remaining life |
8 years 2 months 8 days
|
9 years 11 months 23 days
|
|
|
| Exercise Prices 6.00 [Member] |
|
|
|
|
| Number of warrants outstanding |
|
323,003
|
|
|
| Warrants outstanding, weighted average remaining life |
0 years
|
29 days
|
|
|
| Exercise Prices 12.00 [Member] |
|
|
|
|
| Number of warrants outstanding |
840,667
|
|
|
|
| Warrants outstanding, weighted average remaining life |
7 years 10 months 3 days
|
0 years
|
|
|
| Exercise Prices 13.49 [Member] |
|
|
|
|
| Number of warrants outstanding |
250,000
|
|
|
|
| Warrants outstanding, weighted average remaining life |
9 years 4 months 17 days
|
0 years
|
|
|
| Exercise Prices 13.89 [Member] |
|
|
|
|
| Number of warrants outstanding |
280,000
|
|
|
|
| Warrants outstanding, weighted average remaining life |
9 years 5 months 9 days
|
0 years
|
|
|