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Share Capital - Summary of Number of Options Outstanding Under the Plan (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employees and Directors |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of Options, Outstanding beginning balance | 2,030,613 | 1,686,600 | 595,823
Number of Options, Granted | 712,900 | 404,813 | 1,098,777
Number of Options, Canceled/Forfeited | (39,500) | (60,800) | (8,000)
Number of Options, Outstanding beginning balance | 2,021,829 | 2,030,613 | 1,686,600
Number of Options, Exercised | (682,184) |  |
Weighted Average Price Per Share, Outstanding beginning balance | $ 3.29 | $ 3.23 | $ 3.69
Weighted Average Price Per Share, Granted | 24.62 | 3.50 | 2.99
Weighted Average Price Per Share, Canceled/Forfeited | 5.77 | 3.03 | 5.00
Weighted Average Price Per Share, Outstanding beginning balance | 10.70 | $ 3.29 | $ 3.23
Weighted Average Price Per Share, Exercised | $ 3.49 |  |
Consultants and Other Service Providers |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of Options, Outstanding beginning balance | 634,486 | 513,238 | 332,500
Number of Options, Granted |  | 132,032 | 203,826
Number of Options, Canceled/Forfeited | (5,686) | (6,000) | (23,088)
Number of Options, Outstanding beginning balance | 498,762 | 634,486 | 513,238
Number of Options, Exercised | (130,038) | (4,784) |
Weighted Average Price Per Share, Outstanding beginning balance | $ 4.27 | $ 3.48 | $ 3.14
Weighted Average Price Per Share, Granted |  | 7.15 | 2.98
Weighted Average Price Per Share, Canceled/Forfeited | 2.93 | 1.58 | 2.33
Weighted Average Price Per Share, Outstanding beginning balance | 4.64 | 4.27 | $ 3.48
Weighted Average Price Per Share, Exercised | $ 2.92 | $ 2.45 |

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- Definition 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. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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