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Net loss per share (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Earnings Per Share [Abstract] |
Disclosure of detailed information of earnings per share [Table Text Block] |
|  |  | 2019 |  |  | 2018 |
|  |  | $ |  |  | $ |
Net loss |  | (234,195 | ) |  | (105,587 | )
Basic weighted average number of common shares outstanding (in thousands) |  | 151,266 |  |  | 156,617 |
| Dilutive effect of share options |  | - |  |  | - |
| Diluted weighted average number of common shares |  | 151,266 |  |  | 156,617 |
Net loss per share |  |  |  |  |  |
| Basic and diluted |  | (1.55 | ) |  | (0.67 | )

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