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Share Capital - Stock Option Activity (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]            
Number of Options Outstanding, Beginning balance 2,667,449 2,671,906 2,795,941 2,339,905 2,671,906 2,339,905
Number of Options, Granted 0   122,750   21,900 686,450
Number of Options, Exercised [1] (3,461)   (34,051)   (25,863) (118,719)
Number of Options, Forfeited, cancelled or expired (200)   (52,655)   (4,155) (75,651)
Number of Options Outstanding, Ending balance 2,663,788 2,667,449 2,831,985 2,795,941 2,663,788 2,831,985
Number of Options Exercisable 1,913,129   1,560,573   1,913,129 1,560,573
[1] During the six months ended June 30, 2019, 23,472 stock options were exercised for the same number of common shares for cash (six months ended June 30, 2018 – 36,007). In the same period, the Company issued 863 common shares (six months ended June 30, 2018 – 34,524) for the cashless exercise of 2,391 stock options (six months ended June 30, 2018 – 82,712).