|
|
|
|
2017 |
|
2016 |
|
2015 |
|
|||
|
|
Weighted average fair value |
|
$ |
1.49 |
|
$ |
3.02 |
|
$ |
4.85 |
|
|
|
Weighted average exercise price |
|
$ |
1.90 |
|
$ |
4.90 |
|
$ |
8.57 |
|
|
|
Weighted average share price at grant |
|
$ |
1.90 |
|
$ |
4.90 |
|
$ |
8.57 |
|
|
|
Dividend yield |
|
|
nil |
|
|
nil |
|
|
nil |
|
|
|
Volatility |
|
|
110 |
% |
|
76 |
% |
|
76 |
% |
|
|
Risk-free interest rate |
|
|
1.12 |
% |
|
0.75 |
% |
|
0.75 |
% |
|
|
Expected life |
|
|
5 years |
|
|
5 years |
|
|
5 years |
|
|
|
Forfeiture rate |
|
|
6 |
% |
|
1 |
% |
|
1 |
% |