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Share-based compensation(Tables)
12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Details of the stock option transactions for the years ended December 31, 2017, 2016 and 2015 are summarized as follows:
 
 
 
Number
 
Weighted
average
exercise price
(CAD$)
 
Weighted
average
remaining
contractual life
(years)
 
Aggregate
intrinsic
value
(CAD$)
 
Outstanding as at December 31, 2014
 
 
1,278,290
 
 
4.68
 
 
3.34
 
 
8,411
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options granted
 
 
382,900
 
 
10.84
 
 
 
 
 
 
 
Options exercised
 
 
(129,236)
 
 
3.76
 
 
 
 
 
 
 
Options forfeited
 
 
(45,097)
 
 
8.76
 
 
 
 
 
 
 
Options expired
 
 
(14,260)
 
 
4,169
 
 
 
 
 
 
 
Outstanding as at December 31, 2015
 
 
1,472,597
 
 
5.88
 
 
2.88
 
 
8,024
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options granted
 
 
617,500
 
 
5.97
 
 
 
 
 
 
 
Options forfeited
 
 
(72,200)
 
 
4.94
 
 
 
 
 
 
 
Options expired
 
 
(16,340)
 
 
20.22
 
 
 
 
 
 
 
Outstanding as at December 31, 2016
 
 
2,001,557
 
 
5.82
 
 
2.72
 
 
1,110
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options granted
 
 
1,242,500
 
 
4.16
 
 
 
 
 
 
 
Options exercised
 
 
(324,000)
 
 
2.16
 
 
 
 
 
 
 
Options forfeited
 
 
(20,000)
 
 
5.10
 
 
 
 
 
 
 
Options expired
 
 
(8,000)
 
 
1.70
 
 
 
 
 
 
 
Outstanding as at December 31, 2017
 
 
2,892,057
 
 
5.52
 
 
3.07
 
 
69
 
Exercisable as at December 31, 2017
 
 
1,855,368
 
 
5.90
 
 
2.55
 
 
69
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
At December 31, 2017, stock options to executive officers and directors, employees and consultants were outstanding as follows:
 
 
 
Options outstanding
 
Options exercisable
 
 
 
 
 
 
Weighted
 
Weighted
 
 
 
 
Weighted
 
 
 
 
 
 
average
 
average
 
 
 
 
average
 
 
 
 
 
 
remaining
 
exercise
 
 
 
 
exercise
 
Range of
 
 
 
 
contractual
 
price
 
 
 
 
price
 
exercise prices (CAD$)
 
Number
 
life (years)
 
(CAD$)
 
Number
 
(CAD$)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$1.65 to $2.08
 
 
277,000
 
 
0.22
 
 
1.66
 
 
277,000
 
 
1.66
 
$2.09 to $5.63
 
 
1,477,183
 
 
3.86
 
 
4.26
 
 
703,557
 
 
4.39
 
$5.64 to $7.37
 
 
550,000
 
 
3.47
 
 
6.14
 
 
325,667
 
 
6.14
 
$7.38 to $13.09
 
 
587,874
 
 
2.07
 
 
9.91
 
 
549,144
 
 
9.92
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2,892,057
 
 
3.07
 
 
5.52
 
 
1,855,368
 
 
5.90
 
Schedule Of Nonvested Option Activity [Table Text Block]
A summary of the Company’s non-vested stock option activity and related information for the year ended December 31, 2017 is as follows:
 
 
 
Number
 
Weighted average
 
 
 
of
 
grant-date fair value
 
Non-vested options
 
options
 
(U.S.$)
 
 
 
 
 
 
 
 
 
Non-vested at December 31, 2016
 
 
708,588
 
 
2.27
 
Granted
 
 
1,242,500
 
 
1.53
 
Vested
 
 
(911,039)
 
 
1.90
 
Forfeited
 
 
(3,360)
 
 
0.04
 
 
 
 
 
 
 
 
 
Non-vested at December 31, 2017
 
 
1,036,689
 
 
1.69
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The estimated fair value of the stock options granted was determined using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
 
 
December 31,
2017
 
 
December 31,
2016
 
 
December 31,
2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Dividend yield
 
 
-
 
 
 
-
 
 
 
-
 
Expected volatility
 
 
63.7
%
 
 
65.7
%
 
 
78.4
%
Risk-free interest rate
 
 
1.2
%
 
 
0.7
%
 
 
0.6
%
Expected average life of the options
 
 
3.8 years
 
 
 
3.1 years
 
 
 
3.4 years
 
Estimated forfeiture rate
 
 
-
 
 
 
-
 
 
 
-
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Details of RSU transactions for the years ended December 31, 2017, 2016 and 2015 are summarized as follows:
 
 
 
Number
 
Weighted
average
grant date
fair value
(USD$)
 
Weighted
average
remaining
contractual
life (years)
 
Aggregate
intrinsic
value
(USD$)
 
Outstanding at December 31, 2014
 
 
-
 
$
-
 
 
-
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RSUs granted
 
 
160,598
 
 
9.10
 
 
 
 
 
1,181
 
RSUs vested
 
 
(10,990)
 
 
9.95
 
 
 
 
 
89
 
RSUs forfeited
 
 
(17,500)
 
 
9.95
 
 
 
 
 
 
 
Outstanding as at December 31, 2015
 
 
132,108
 
$
8.91
 
 
2.16
 
$
1,058
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RSUs granted
 
 
50,782
 
 
4.43
 
 
 
 
 
218
 
RSUs vested
 
 
(49,682)
 
 
9.03
 
 
 
 
 
205
 
RSUs forfeited
 
 
(13,505)
 
 
9.00
 
 
 
 
 
 
 
Outstanding as at December 31, 2016
 
 
119,703
 
$
6.95
 
 
1.71
 
$
334
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
RSUs granted
 
 
52,962
 
 
3.46
 
 
 
 
 
194
 
RSUs vested
 
 
(57,003)
 
 
7.59
 
 
 
 
 
174
 
RSUs forfeited
 
 
(18,706)
 
 
6.21
 
 
 
 
 
 
 
Outstanding as at December 31, 2017
 
 
96,956
 
$
4.83
 
 
1.68
 
$
147