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Share Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of share-based payment arrangement [Abstract] |
Schedule of stock options and weighted average exercise prices of share options | We have issued stock options to acquire common stock through our stock option plan of which the following are outstanding at December 31:
| 2018 | 2017 | 2016
| Stock Options | Weighted Average Exercise Price $ | Stock Options | Weighted Average Exercise Price $ | Stock Options | Weighted Average Exercise Price $
Outstanding, beginning of the year | 647,156 |  | 13.20 | 912,995 |  | 17.42 | 901,114 |  | 20.58
Granted during the year | 750,467 |  | 4.97 | 42,625 |  | 4.60 | 165,460 |  | 2.67
Forfeited during the year | (105,338 | ) | 11.67 | (211,847 | ) | 32.80 | (77,629 | ) | 6.18
Expired during the year | (1,122 | ) | 13.78 | (12,302 | ) | 21.13 | (75,950 | ) | 34.27
Exercised during the year | (41,802 | ) | 2.96 | (84,315 | ) | 4.07 | — |  | —
Outstanding, end of the year | 1,249,361 |  | 8.73 | 647,156 |  | 13.20 | 912,995 |  | 17.42
Options exercisable, end of the year | 777,245 |  | 11.04 | 573,984 |  | 14.36 | 689,883 |  | 22.03
Schedule of stock options outstanding and exercisable by range of exercise price | The following table summarizes information about the stock options outstanding and exercisable at December 31, 2018:
Range of Exercise Prices | Number Outstanding | Weighted Average Remaining Contractual Life (years) | Weighted Average Exercise Price $ | Number Exercisable | Weighted Average Exercise Price $
$2.47 - $3.99 | 711,827 |  | 5.95 | 3.21 | 442,231 |  | 3.25
$4.84 - $7.81 | 335,092 |  | 3.76 | 7.21 | 132,572 |  | 7.09
$13.77 - $19.00 | 92,308 |  | 4.63 | 16.94 | 92,308 |  | 16.94
$20.23 - $36.96 | 51,777 |  | 2.71 | 32.29 | 51,777 |  | 32.29
$38.09 - $63.84 | 58,357 |  | 2.93 | 50.85 | 58,357 |  | 50.85
| 1,249,361 |  | 4.99 | 8.73 | 777,245 |  | 11.04
Schedule of weighted average remaining contractual life and outstanding stock options by exercise price | The following table summarizes our outstanding warrants at December 31, 2018:
Exercise Price | Outstanding, Beginning of the Year | Exercised During the Year | Outstanding, End of the Year(1) | Weighted Average Remaining Contractual Life (years)
$ | 9.025 |  | 16,445,000 |  | (1,500 | ) | 16,443,500 |  | 3.42 |
(1) Exercisable into 1,730,894 common shares. The following table summarizes information about the stock options outstanding and exercisable at December 31, 2018:
Range of Exercise Prices | Number Outstanding | Weighted Average Remaining Contractual Life (years) | Weighted Average Exercise Price $ | Number Exercisable | Weighted Average Exercise Price $
$2.47 - $3.99 | 711,827 |  | 5.95 | 3.21 | 442,231 |  | 3.25
$4.84 - $7.81 | 335,092 |  | 3.76 | 7.21 | 132,572 |  | 7.09
$13.77 - $19.00 | 92,308 |  | 4.63 | 16.94 | 92,308 |  | 16.94
$20.23 - $36.96 | 51,777 |  | 2.71 | 32.29 | 51,777 |  | 32.29
$38.09 - $63.84 | 58,357 |  | 2.93 | 50.85 | 58,357 |  | 50.85
| 1,249,361 |  | 4.99 | 8.73 | 777,245 |  | 11.04
Disclosure weighted average assumptions and fair value of options | The estimated fair value of stock options issued during the year was determined using the Black Scholes Option Pricing Model using the following weighted average assumptions and fair value of options:
| 2018 | 2017 | 2016
Risk-free interest rate | 2.02% | 1.18% | 0.82%
Expected hold period to exercise | 3.0 years | 3.0 years | 3.0 years
Volatility in the price of the Company's shares | 81.15% | 90.73% | 94.84%
Rate of forfeiture | 3.67% | 3.67% | 3.67%
Dividend yield | Nil | Nil | Nil
Weighted average fair value of options | $2.67 | $2.65 | $1.59
Schedule of number of other equity instruments | The following PSUs are outstanding at December 31:
| 2018 | 2017 | 2016
Outstanding, beginning of the year | 94,734 |  | 88,419 |  | — |
Granted during the year | — |  | 6,315 |  | 157,892 |
Forfeited during the year | (31,578 | ) | — |  | (69,473 | )
Outstanding, end of the year | 63,156 |  | 94,734 |  | 88,419 |
(1) The weighted average fair value of the PSUs granted was nil in 2018 (2017 - $3.33; 2016 - $3.38). The following RSUs are outstanding at December 31:
| 2018 | 2017 | 2016
Outstanding, beginning of the year | 190,407 |  | 139,237 |  | 38,823 |
Granted during the year | 102,855 |  | 51,170 |  | 110,940 |
Forfeited during the year | (4,210 | ) | — |  | (10,526 | )
Vested during the year | (28,297 | ) | — |  | — |
Outstanding, end of the year | 260,755 |  | 190,407 |  | 139,237 |
(1)The weighted average fair value of the RSUs granted was $3.35 in 2018 (2017 - $5.96; 2016 - $2.92).

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