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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of classes of share capital [abstract] |
Schedule of Share Capital |
|  | December 31, |  |  | December 31, |
|  | 2017 |  |  | 2016 |
Issued |  |  |  |  |  |
41,496,950 (2016: 39,540,384) common shares |  | $ | 207,012 |  |  | $ | 202,191 |
Schedule of Changes in Company's Outstanding Stock Options | A summary of changes in the Company’s outstanding stock options is presented below:
|  |  |  |  | December 31, |  |  |  |  |  | December 31, |
|  |  |  |  | 2017 |  |  |  |  |  | 2016 |
|  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  |  |  | average |  |  |  |  |  | average |
|  |  |  |  | exercise |  |  |  |  |  | exercise |
|  | Number |  |  | price |  |  | Number |  |  | price |
|  | (thousands) |  |  | CAD |  |  | (thousands) |  |  | CAD |
Balance, beginning of year |  |  | 1,771 |  |  | $ | 4.64 |  |  |  | 1,516 |  |  | $ | 9.50 |
Granted |  |  | 1,058 |  |  |  | 3.86 |  |  |  | 808 |  |  |  | 2.09 |
Exercised |  |  | (261 | ) |  |  | 3.22 |  |  |  | (93 | ) |  |  | 3.12 |
Expired |  |  | (252 | ) |  |  | 17.31 |  |  |  | (460 | ) |  |  | 16.50 |
Balance, end of year |  |  | 2,316 |  |  | $ | 3.06 |  |  |  | 1,771 |  |  | $ | 4.64 |
Schedule of Stock Options Outstanding and Exercisable | The following table summarizes information on stock options outstanding and exercisable as at December 31, 2017:
|  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | average |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  | remaining |  |  |  |  |  | average |  |  |  |  |  | average |
| Exercise |  | contractual |  |  |  |  |  | exercise |  |  |  |  |  | exercise |
| price |  | life |  |  | Outstanding |  |  | price |  |  | Exercisable |  |  | price |
| CAD |  | (years) |  |  | (thousands) |  |  | CAD |  |  | (thousands) |  |  | CAD |
| 2.00 to 3.00 |  |  | 0.78 |  |  |  | 1,163 |  |  | $ | 2.14 |  |  |  | 899 |  |  | $ | 2.17 |
| 3.01 to 4.00 |  |  | 2.07 |  |  |  | 1,050 |  |  |  | 3.85 |  |  |  | 350 |  |  |  | 3.85 |
| 4.01 to 5.00 |  |  | 1.75 |  |  |  | 25 |  |  |  | 4.59 |  |  |  | 14 |  |  |  | 4.63 |
| 5.01 to 6.00 |  |  | 0.41 |  |  |  | 78 |  |  |  | 5.65 |  |  |  | 78 |  |  |  | 5.65 |
|  |  |  |  |  |  |  | 2,316 |  |  | $ | 3.06 |  |  |  | 1,341 |  |  | $ | 2.84 |
Fair Value Weighted Average Assumptions | The Company used the Black-Scholes Option Pricing Model to estimate fair value using the following weighted-average assumptions:
|  | Year ended |  |  | Year ended |
|  | December 31, |  |  | December 31, |
|  | 2017 |  |  | 2016 |
Expected stock price volatility (1) |  |  | 83 | % |  |  | 83 | %
Risk free interest rate |  |  | 0.87 | % |  |  | 0.47 | %
Expected life |  | 3 years |  | 3 years
Expected forfeiture rate |  |  | 4.18 | % |  |  | 4.97 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Share-based payments included in cost of sales |  | $ | - |  |  | $ | 19 |
Share-based payments included in general and |  |  |  |  |  |  |  |
administrative expenses |  |  | 1,491 |  |  |  | 566 |
Total share-based payments |  | $ | 1,491 |  |  | $ | 585 |
Warrants Issued and Outstanding | The warrants that are issued and outstanding as at December 31, 2017 are as follows:
Number of | Exercise | Issuance | Expiry
warrants | price (CAD) | date | date
742,883 | 4.68 | Jul 2016 | Jun 14, 2021
224,728 | 4.20 | Jul 2016 | Jun 14, 2018
1,350,204 | 4.68 | Jun 2016 | Jun 9, 2021
388,886 | 4.20 | Jun 2016 | Jun 9, 2018
1,537,355 | 1.20 | Feb 2016 | Feb 10, 2019
307,777 | 1.20 | Nov 2015 | Nov 10, 2018
29,166 | 1.56 | Aug 2015 | Aug 26, 2018
190,906 | 3.00 | Aug 2015 | Aug 26, 2018
395,486 | 1.56 | May 2015 | May 27, 2018
5,167,391 |  |  |

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