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Basic and diluted loss per share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
16.
Basic and diluted loss per share:
 
Basic loss per share is calculated as set forth below:
 
Year ended December 31
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
$
(29,811)
 
$
(19,619)
 
$
(24,462)
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of common shares for basic loss per share
 
 
33,192,480
 
 
25,255,413
 
 
18,198,840
 
Loss per share – basic
 
$
(0.90)
 
$
(0.78)
 
$
(1.34)
 
 
 
 
 
 
 
 
 
 
 
 
Diluted loss per share is calculated as set forth below:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year ended December 31
 
 
2017
 
 
2016
 
2015
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
$
(29,811)
 
$
(19,619)
 
$
(24,462)
 
Less: recovery of fair value of liability classified awards
 
 
(153)
 
 
(433)
 
 
-
 
Diluted loss available to common shareholders
 
$
(29,964)
 
$
(20,052)
 
$
(24,462)
 
Weighted average number of common shares for basic loss per share
 
 
33,192,480
 
 
25,255,413
 
 
18,198,840
 
Plus: incremental shares from assumed exercise
 
 
35,444
 
 
62,783
 
 
-
 
Diluted weighted average number of common shares for diluted loss per share
 
 
33,227,924
 
 
25,318,196
 
 
18,198,840
 
Loss per share – diluted
 
$
(0.90)
 
$
(0.79)
 
$
(1.34)
 
  
For the year ended December 31, 2017, $5 of the recovery of fair value of liability classified awards has been excluded from the calculation of diluted loss available to common shareholders due to the fact that it is anti-dilutive (for the year ended December 31, 2016 - $890; for the year ended December 31, 2015 - nil).