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Share Capital - Summary of Number of Options Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, number of options outstanding at end of year | shares	2,520,591
Options exercisable, number of options outstanding at end of year | shares	1,194,811
0.00 - 10.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option exercise prices ranging lower limit | $ / shares	$ 0.00
Stock option exercise prices ranging upper limit | $ / shares	$ 10.00
Options outstanding, number of options outstanding at end of year | shares	1,948,091
Options outstanding, weighted average remaining contractual life	4 years 7 months 13 days
Options exercisable, number of options outstanding at end of year | shares	1,142,310
Options exercisable, weighted average remaining contractual life	3 years 11 months 23 days
10.01 - 20.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option exercise prices ranging lower limit | $ / shares	$ 10.01
Stock option exercise prices ranging upper limit | $ / shares	$ 20.00
Options outstanding, number of options outstanding at end of year | shares	292,500
Options outstanding, weighted average remaining contractual life	9 years 5 months 26 days
Options exercisable, number of options outstanding at end of year | shares	52,501
Options exercisable, weighted average remaining contractual life	9 years 6 months 3 days
20.01 - 30.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option exercise prices ranging lower limit | $ / shares	$ 20.01
Stock option exercise prices ranging upper limit | $ / shares	$ 30.00
Options outstanding, number of options outstanding at end of year | shares	100,000
Options outstanding, weighted average remaining contractual life	9 years 9 months 25 days
30.01 - 40.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option exercise prices ranging lower limit | $ / shares	$ 30.01
Stock option exercise prices ranging upper limit | $ / shares	$ 40.00
Options outstanding, number of options outstanding at end of year | shares	180,000
Options outstanding, weighted average remaining contractual life	9 years 9 months 21 days

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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