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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock-based compensation expenses included in general and administrative expenses | Stock-based compensation expenses included in general and administrative expenses are as follows:
Year ended December 31, |  | 2013 |  |  | 2012 |
Share option plan (note 23(b)) |  | $ | 981 |  |  | $ | 1,327 |
Restricted share unit plan (note 23(d)) |  | 2,652 |  |  | (297 | )
Directors' deferred stock unit plan (note 23(e)) |  | 2,560 |  |  | (547 | )
Stock award plan (note 23(f)) |  | — |  |  | 47 |
|  | $ | 6,193 |  |  | $ | 530 |
Schedule of stock options activity |
|  | Number of options |  |  | Weighted average exercise price $ per share |
Outstanding at December 31, 2011 |  | 1,864,434 |  |  | 8.78 |
Granted |  | 1,517,400 |  |  | 2.83 |
Exercised(i) |  | (1,920 | ) |  | (3.69 | )
Forfeited |  | (350,180 | ) |  | (9.65 | )
Outstanding at December 31, 2012 |  | 3,029,734 |  |  | 5.70 |
Granted |  | 177,400 |  |  | 5.91 |
Exercised(i) |  | (295,230 | ) |  | (3.98 | )
Forfeited |  | (698,624 | ) |  | (7.12 | )
Outstanding at December 31, 2013 |  | 2,213,280 |  |  | 5.51 |
(i) | All stock options exercised resulted in new common shares being issued (note 18(a));
Summary of information about stock options outstanding | The following table summarizes information about stock options outstanding at December 31, 2013:
|  | Options outstanding |  |  | Options exercisable |
Exercise price |  | Number |  |  | Weighted average remaining life |  | Weighted average exercise price |  |  | Number |  |  | Weighted average remaining life |  |  | Weighted average exercise price |
$2.75 |  | 414,440 |  |  | 8.5 years |  | $ | 2.75 |  |  | 46,440 |  |  | 8.3 years |  |  | $ | 2.75 |
$2.79 |  | 680,000 |  |  | 8.5 years |  | $ | 2.79 |  |  | 80,000 |  |  | 8.5 years |  |  | $ | 2.79 |
$3.69 |  | 68,100 |  |  | 4.2 years |  | $ | 3.69 |  |  | 68,100 |  |  | 4.2 years |  |  | $ | 3.69 |
$4.90 |  | 40,000 |  |  | 8.3 years |  | $ | 4.90 |  |  | 8,000 |  |  | 8.3 years |  |  | $ | 4.90 |
$5.00 |  | 221,760 |  |  | 1.6 years |  | $ | 5.00 |  |  | 221,760 |  |  | 1.6 years |  |  | $ | 5.00 |
$5.91 |  | 177,400 |  |  | 10.0 years |  | $ | 5.91 |  |  | — |  |  | — |  |  | — |
$6.56 |  | 118,860 |  |  | 7.0 years |  | $ | 6.56 |  |  | 56,520 |  |  | 6 years |  |  | $ | 6.56 |
$8.28 |  | 60,000 |  |  | 5.5 years |  | $ | 8.28 |  |  | 48,000 |  |  | 5.5 years |  |  | $ | 8.28 |
$8.58 |  | 30,000 |  |  | 6.7 years |  | $ | 8.58 |  |  | 18,000 |  |  | 6.7 years |  |  | $ | 8.58 |
$9.33 |  | 84,460 |  |  | 5.3 years |  | $ | 9.33 |  |  | 54,540 |  |  | 5.5 years |  |  | $ | 9.33 |
$10.13 |  | 82,780 |  |  | 6.2 years |  | $ | 10.13 |  |  | 55,860 |  |  | 5.8 years |  |  | $ | 10.13 |
$13.21 |  | 75,000 |  |  | 4.0 years |  | $ | 13.21 |  |  | 75,000 |  |  | 4 years |  |  | $ | 13.21 |
$13.50 |  | 82,720 |  |  | 3.7 years |  | $ | 13.50 |  |  | 82,720 |  |  | 3.7 years |  |  | $ | 13.50 |
$16.46 |  | 50,000 |  |  | 4.3 years |  | $ | 16.46 |  |  | 50,000 |  |  | 4.3 years |  |  | $ | 16.46 |
$16.75 |  | 27,760 |  |  | 2.7 years |  | $ | 16.75 |  |  | 27,760 |  |  | 2.7 years |  |  | $ | 16.75 |
|  | 2,213,280 |  |  | 6.9 years |  | $ | 5.51 |  |  | 892,700 |  |  | 4.5 years |  |  | $ | 8.00 |
Schedule of restricted share unity plan activity |
|  | Number of units |
Outstanding at December 31, 2011 |  | 1,209,832 |
Granted |  | 625,405 |
Settled |  | (345,679 | )
Forfeited |  | (379,283 | )
Outstanding at December 31, 2012 |  | 1,110,275 |
Granted |  | 555,204 |
Settled |  | (154,330 | )
Forfeited |  | (487,205 | )
Outstanding at December 31, 2013 |  | 1,023,944 |
Share option plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of assumptions used to value stock option grants | The fair value of each option granted by the Company was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
Year ended December 31, |  | 2013 |  |  | 2012 |
Number of options granted |  | 177,400 |  |  | 1,517,400 |
Weighted average fair value per option granted ($) |  | 3.73 |  |  | 1.88 |
Weighted average assumptions: |  |  |  |
Dividend yield |  | N/A |  |  | N/A |
Expected volatility |  | 69.11 | % |  | 74.52 | %
Risk-free interest rate |  | 1.91 | % |  | 1.02 | %
Expected life (years) |  | 6.2 |  |  | 6.4 |
Senior executive stock option plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of assumptions used to value stock option grants | The weighted average assumptions used in estimating the fair value of the fully vested senior executive stock options as at December 31, 2013 and 2012 are as follows:
Year ended December 31, |  | 2013 |  |  | 2012 |
Number of senior executive stock options |  | 550,000 |  |  | 550,000 |
Weighted average fair value per option granted ($) |  | 1.71 |  |  | 1.08 |
Weighted average assumptions: |  |  |  |
Dividend yield |  | N/A |  |  | N/A |
Expected volatility |  | 39.12 | % |  | 72.78 | %
Risk-free interest rate |  | 0.22 | % |  | 0.29 | %
Expected life (years) |  | 1.4 |  |  | 2.4 |
Directors' deferred share unit plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock plan activity |
|  | Number of units |
Outstanding at December 31, 2011 |  | 421,749 |
Issued |  | 266,820 |
Redeemed |  | (63,413 | )
Outstanding at December 31, 2012 |  | 625,156 |
Issued |  | 141,509 |
Redeemed |  | (179,831 | )
Outstanding at December 31, 2013 |  | 586,834 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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