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Share Capital - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |  |  |  |
Number of Stock Options Outstanding, Outstanding at Beginning Balance | [1] | 414,965 | 174,328 |  | 77,846 |
Number of Stock Options Outstanding, Granted |  | 10,000 | 272,090 | [1] | 96,482 | [1]
Number of Stock Options Outstanding, Exercised |  | (2,487) | (31,453) | [1] |  |
Number of Stock Options Outstanding, Cancelled |  |  |  | [1] |  | [1]
Number of Stock Options Outstanding, Outstanding at Ending Balance |  | 422,478 | 414,965 | [1] | 174,328 | [1]
Number of Stock Options Outstanding, Vested and expected-to-vest at end of period |  | 228,758 | 142,875 | [1] | 174,328 | [1]
Weighted Average Exercise Price, Outstanding at Beginning Balance | [1] | $ 11.7 | $ 1.95 |  | $ 4.2 |
Weighted Average Exercise Price, Granted |  | 9 | 16.5 | [1] |  | [1]
Weighted Average Exercise Price, Exercised |  |  |  | [1] |  | [2]
Weighted Average Exercise Price, Cancelled |  |  |  | [1] |  | [2]
Weighted Average Exercise Price, Outstanding at Ending Balance |  | 11.70 | 11.7 | [1] | 1.95 | [1]
Weighted Average Exercise Price, Vested and expected-to-vest at end of period |  | $ 7.80 | $ 1.95 | [1] | $ 1.95 | [1]
Aggregate intrinsic value, Stock Options Outstanding at Beginning period | [1] | $ 1,859 | $ 3,739 |  |  |
Aggregate intrinsic value, Stock Options Outstanding at End period |  | 729 | 1,859 | [1] | $ 3,739 | [1]
Aggregate intrinsic value, Vested and expected-to-vest at end of period |  | $ 729 | $ 1,375 | [1] | $ 15,624 | [1]
[1] | December 31, 2017 options data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018.
[2] | Less than 1

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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 + Details
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