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Common Shares - Summary Of The Status Of Unvested Stock Options (Details) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of options (in shares)		0	1,142,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of options, beginning of period (in shares)	759,669	246,250	246,250
Granted, Number of options (in shares)			1,142,000
Cancelled/Forfeited, Number of options (in shares)			(246,250)
Vested, Number of options (in shares)	(286,666)		(382,331)
Unvested, Number of options, end of period (in shares)	473,003		759,669	246,250
Unvested, Weighted average grant date fair value, beginning of period (in dollars per share)	$ 0.45	$ 0.22	$ 0.22
Granted, Weighted average grant-date fair value per option (in dollars per share)			0.45
Cancelled/Forfeited, Weighted average grant-date fair value per option (in dollars per share)			0.22
Vested, Weighted average grant-date fair value per option (in dollars per share)	0.48		0.45
Unvested, Weighted average grant date fair value per option, end of period (in dollars per share)	$ 0.44		$ 0.45	$ 0.22
Weighted average remaining amortization period	1 year 29 days		1 year 1 month 21 days	11 months 27 days

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Weighted average grant-date fair value of options vested.

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Non vested options at the beginning of the period that vest during the period.

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