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BASIC AND DILUTED LOSS PER COMMON SHARE
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Basic and Diluted Loss Per Common Share BASIC AND DILUTED LOSS PER COMMON SHARE
The following is a reconciliation of weighted average common shares outstanding for the years ended December 31, 2020, 2019, 2018, respectively:
Years ended December 31,
202020192018
Issued shares at beginning of period 100,735,889 91,445,066 74,366,824 
  Effect of share options exercised 12,934 45,040 115,330 
Effect of shares issued for settlement of vesting of restricted share units452,932 786,746 829,610 
  Effect of shares issued for exercise of share purchase warrants— 1,057 44,185 
  Shares issued for consulting services74,672 46,067 122,854 
  Effect of shares issued in asset acquisitions— — 419,986 
  Effect of shares issued for conversion of Convertible Debentures— — 323 
  Effect of shares issued to settle liabilities— 141,525 — 
  Effect of shares issued in public offerings19,891,709 3,199,866 7,576,288 
Weighted average common shares outstanding121,168,136 95,665,367 83,475,400 

Basic and diluted loss per common share
The calculation of basic and diluted loss per share after adjustment for the effects of all potential dilutive Common Shares, calculated as follows:
 Years ended December 31,
 202020192018
Net loss attributable to owners of the Company$(27,776)$(37,978)$(25,245)
Basic and diluted weighted average common shares outstanding121,168,136 95,665,367 83,475,400 
Net loss per common share$(0.23)$(0.40)$(0.30)
For the three years ended December 31, 2020, 2019 and 2018, 5.78 million, 5.65 million and 8.23 million options and warrants, respectively, and the potential conversion of the Convertible Debentures have been excluded from the calculation as their effect would have been anti-dilutive.