Share-Based Compensation - assumptions and inputs (Details)		12 Months Ended
Dec. 01, 2017 Option	Dec. 31, 2018 Y CAD ($) $ / shares	Dec. 31, 2018 Y CAD ($) $ / shares $ / shares	Dec. 31, 2017 Y CAD ($) $ / shares	Dec. 31, 2017 Y CAD ($) $ / shares $ / shares
Share-Based Compensation
Number of options granted	535,000	20,000	20,000	535,000	535,000
Vesting requirements		Immediately	Immediately	Immediately	Immediately
Contractual life		9 years 6 months 15 days	9 years 6 months 15 days	10 years	10 years
Method of settlement		In equity	In equity	In equity	In equity
Exercise price, share options granted		$ 8.76		$ 8.76
Market price per share on grant date		$ 6.30	$ 6.30	$ 8.40	$ 8.40
Expected volatility		37.86%	37.86%	37.74%	37.74%
Expected option life \| Y		9.54	9.54	10	10
Expected dividends		0.00%	0.00%	0.00%	0.00%
Risk-free interest rate		2.93%	2.93%	2.38%	2.38%
Fair value of option granted (per option) \| (per share)		$ 2.69	$ 3.44	$ 4.22	$ 5.38

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

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The description of the method of settlement (for example, whether in cash or equity) for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]]

+ References

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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]]

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The exercise price of share options granted.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The number of share options granted in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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The market price per share on grant date.

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