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BASIC AND DILUTED LOSS PER COMMON SHARE | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Loss Per Common Share | BASIC AND DILUTED LOSS PER COMMON SHAREThe calculation of basic and diluted earnings per share after adjustment for the effects of all potential dilutive Common Shares, is as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Loss attributable to shareholders | $ | (10,784) |  |  | $ | (8,187) |  |  | $ | (21,692) |  |  | $ | (13,844) |
Basic and diluted weighted average number of common shares outstanding | 144,450,494 |  |  | 102,322,778 |  |  | 140,923,146 |  |  | 112,868,921 |
Loss per common share | $ | (0.07) |  |  | $ | (0.08) |  |  | $ | (0.15) |  |  | $ | (0.12) |
For the six months ended June 30, 2021, 3.68 million (June 30, 2020 - 6.10 million) options and warrants have been excluded from the calculation, as their effect would have been anti-dilutive.

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