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Shareholders' Equity (Summary of Warrant and Deferred Share Unit Activity) (Detail) - Deferred Share Units [Member]	9 Months Ended
	Sep. 30, 2018 shares
Warrant
Outstanding at December 31, 2017	13,138
Granted	4,038
Outstanding at September 30, 2018	17,176

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options [Abstract]

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The number of equity-based instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Details

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