Stock Options - Summary of Stock Options Activity (Details)	3 Months Ended
Mar. 31, 2018 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of options, Outstanding beginning balance	3,315,000
Number of options, Granted
Number of options, Exercised
Number of options, Expired	(100,000)
Number of options, Outstanding ending balance	3,215,000

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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-SubTopic 10
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Number of share options (or share units) exercised during the current period.

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