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Share capital (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of classes of share capital [abstract]  
Schedule of Share Capital
 
 
December 31,
   
December 31,
 
 
 
2017
   
2016
 
 
           
Issued
           
41,496,950 (2016: 39,540,384) common shares
 
$
207,012
   
$
202,191
 
Schedule of Changes in Company's Outstanding Stock Options
A summary of changes in the Company’s outstanding stock options is presented below:
 
 

 
       
December 31,
         
December 31,
 
 
       
2017
         
2016
 
 
       
Weighted
         
Weighted
 
 
       
average
         
average
 
 
       
exercise
         
exercise
 
 
 
Number
   
price
   
Number
   
price
 
 
 
(thousands)
   
CAD
   
(thousands)
   
CAD
 
 
                       
Balance, beginning of year
   
1,771
   
$
4.64
     
1,516
   
$
9.50
 
Granted
   
1,058
     
3.86
     
808
     
2.09
 
Exercised
   
(261
)
   
3.22
     
(93
)
   
3.12
 
Expired
   
(252
)
   
17.31
     
(460
)
   
16.50
 
Balance, end of year
   
2,316
   
$
3.06
     
1,771
   
$
4.64
 

Schedule of Stock Options Outstanding and Exercisable
The following table summarizes information on stock options outstanding and exercisable as at December 31, 2017:

 
 
 
Weighted
                         
 
 
 
average
         
Weighted
         
Weighted
 
 
 
 
remaining
         
average
         
average
 
 
 Exercise
 
contractual
         
exercise
         
exercise
 
 
 price
 
life
   
Outstanding
   
price
   
Exercisable
   
price
 
 
 CAD
 
(years)
   
(thousands)
   
CAD
   
(thousands)
   
CAD
 
 
 
                             
 
 2.00 to 3.00
   
0.78
     
1,163
   
$
2.14
     
899
   
$
2.17
 
 
 3.01 to 4.00
   
2.07
     
1,050
     
3.85
     
350
     
3.85
 
 
 4.01 to 5.00
   
1.75
     
25
     
4.59
     
14
     
4.63
 
 
 5.01 to 6.00
   
0.41
     
78
     
5.65
     
78
     
5.65
 
 
 
           
2,316
   
$
3.06
     
1,341
   
$
2.84
 
Fair Value Weighted Average Assumptions
The Company used the Black-Scholes Option Pricing Model to estimate fair value using the following weighted-average assumptions:

 
 
Year ended
   
Year ended
 
 
 
December 31,
   
December 31,
 
 
 
2017
   
2016
 
 
           
Expected stock price volatility (1)
   
83
%
   
83
%
Risk free interest rate
   
0.87
%
   
0.47
%
Expected life
 
3 years
 
3 years
Expected forfeiture rate
   
4.18
%
   
4.97
%
Expected dividend yield
   
0
%
   
0
%
 
               
Share-based payments included in cost of sales
 
$
-
   
$
19
 
Share-based payments included in general and
               
   administrative expenses
   
1,491
     
566
 
Total share-based payments
 
$
1,491
   
$
585
 

Warrants Issued and Outstanding
The warrants that are issued and outstanding as at December 31, 2017 are as follows:
 

 
Number of
 Exercise
 Issuance
 Expiry
    warrants
 price (CAD)
 date
 date
   742,883
                                                     4.68
 Jul 2016
 Jun 14, 2021
   224,728
                                                     4.20
 Jul 2016
 Jun 14, 2018
1,350,204
                                                     4.68
 Jun 2016
 Jun 9, 2021
   388,886
                                                     4.20
 Jun 2016
 Jun 9, 2018
1,537,355
                                                      1.20
 Feb 2016
 Feb 10, 2019
   307,777
                                                      1.20
 Nov 2015
 Nov 10, 2018
     29,166
                                                      1.56
 Aug 2015
 Aug 26, 2018
   190,906
                                                     3.00
 Aug 2015
 Aug 26, 2018
   395,486
                                                      1.56
 May 2015
 May 27, 2018
5,167,391