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Share Based Payments (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of share-based payment arrangement [Abstract]  
Schedule of stock options and weighted average exercise prices of share options
We have issued stock options to acquire common stock through our stock option plan of which the following are outstanding at December 31:
202020192018
Stock OptionsWeighted Average Exercise Price
$		Stock OptionsWeighted Average Exercise Price
$		Stock OptionsWeighted Average Exercise Price
$
Outstanding, beginning of the year
2,246,947 5.311,249,361 8.73647,156 13.20
Granted during the year1,817,500 3.191,020,000 1.42750,467 4.97
Forfeited during the year(141,418)3.84(12,839)11.35(105,338)11.67
Expired during the year(25,520)62.49(9,575)29.07(1,122)13.78
Exercised during the year(133,454)1.81— —(41,802)2.96
Outstanding, end of the
year		3,764,055 4.082,246,947 5.311,249,361 8.73
Options exercisable, end of the year
2,164,551 4.841,327,845 7.22777,245 11.04
Schedule of stock options outstanding and exercisable by range of exercise price
The following table summarizes information about the stock options outstanding and exercisable at December 31, 2020:
Range of Exercise PricesNumber OutstandingWeighted Average Remaining Contractual Life (years)Weighted Average Exercise Price
$		Number ExercisableWeighted Average Exercise Price
$
$0.54 - $1.79
808,333 3.031.39545,009 1.37
$1.80 - $3.01
459,730 4.492.66289,730 2.68
$3.02 - $3.90
1,834,706 3.863.21769,696 3.26
$3.91 - $7.41
493,252 2.686.13392,082 6.02
$7.42 - $52.63
168,034 2.3224.32168,034 24.32
3,764,055 3.534.082,164,551 4.84
Schedule of weighted average remaining contractual life and outstanding stock options by exercise price
The following table summarizes our outstanding equity warrants:
Number of Warrants Outstanding(1)
Warrant
$
Balance, December 31, 201716,445,000 3,617,900 
Issued pursuant to equity warrant exercised(1,500)(330)
Balance, December 31, 201816,443,500 3,617,570 
Balance, December 31, 201916,443,500 3,617,570 
Balance, December 31, 202016,443,500 3,617,570 
(1) Exercisable into 1,730,894 common shares.
The following table summarizes information about the stock options outstanding and exercisable at December 31, 2020:
Range of Exercise PricesNumber OutstandingWeighted Average Remaining Contractual Life (years)Weighted Average Exercise Price
$		Number ExercisableWeighted Average Exercise Price
$
$0.54 - $1.79
808,333 3.031.39545,009 1.37
$1.80 - $3.01
459,730 4.492.66289,730 2.68
$3.02 - $3.90
1,834,706 3.863.21769,696 3.26
$3.91 - $7.41
493,252 2.686.13392,082 6.02
$7.42 - $52.63
168,034 2.3224.32168,034 24.32
3,764,055 3.534.082,164,551 4.84
Disclosure weighted average assumptions and fair value of options
The estimated fair value of stock options issued during the year was determined using the following weighted average assumptions:
202020192018
Risk-free interest rate0.34%1.62%2.02%
Expected hold period to exercise3.0 years3.0 years3.0 years
Expected share price volatility110.82%97.9%81.15%
Expected forfeiture rate3.67%3.67%3.67%
Expected dividend yieldNilNilNil
Weighted average fair value of options$2.12$0.87$2.67
Schedule of number of other equity instruments The following RSUs are outstanding at December 31:
202020192018
Outstanding, beginning of the year209,657 260,755 190,407 
Granted during the year154,923 270,098 102,855 
Forfeited during the year— — (4,210)
Released during the year(229,962)(321,196)(28,297)
Outstanding, end of the year134,618 209,657 260,755 
(1) The weighted average fair value of the RSUs granted was $2.41 in 2020 (2019 - $0.80 ; 2018 - $3.35).
The following PSUs are outstanding at December 31:
202020192018
Outstanding, beginning of the year61,051 63,156 94,734 
Forfeited during the year— — (31,578)
Released during the year(4,210)(2,105)— 
Outstanding, end of the year56,841 61,051 63,156