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Stock Options - Summary of Outstanding Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Number of shares, Beginning balance | 1,040,387 | 756,692 | 504,550 |
Number of shares, Granted | 471,144 | 359,319 | 512,402 |
Number of shares, Exercised | (284,455) | (58,155) | (24,260) |
Number of shares, Expired/Forfeited | (23,449) | (17,469) | (236,000) |
Number of shares, Ending balance | 1,203,627 | 1,040,387 | 756,692 | 504,550
Number of shares, Vested and exercisable | 523,566 |  |  |
Number of shares, Vested and expected to vest | 1,203,627 |  |  |
Weighted average exercise price, Beginning balance | $ 2.25 | $ 2.10 | $ 2.60 |
Weighted average exercise price, Granted | 14.72 | 2.60 | 2.00 |
Weighted average exercise price, Exercised | 2.07 | 2.36 | 3.19 |
Weighted average exercise price, Expired/Forfeited | 8.22 | 2.13 | 2.77 |
Weighted average exercise price, Ending balance | 7.06 | $ 2.25 | $ 2.10 | $ 2.60
Weighted average exercise price, Vested and exercisable | 2.21 |  |  |
Weighted average exercise price, Vested and expected to vest | $ 7.06 |  |  |
Weighted average remaining contractual term | 8 years 1 month 6 days | 7 years 9 months 18 days | 7 years 7 months 6 days | 5 years 9 months 18 days
Weighted average remaining contractual term, Granted | 5 years 2 months 12 days | 9 years 4 months 24 days | 9 years 2 months 12 days |
Weighted average remaining contractual term, Exercised | 5 years 2 months 12 days | 3 years 6 months |  |
Weighted average remaining contractual term, Expired/Forfeited |  | 2 years 7 months 6 days |  |
Weighted average remaining contractual term, Vested and exercisable | 7 years |  |  |
Weighted average remaining contractual term, Vested and expected to vest | 8 years 1 month 6 days |  |  |

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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://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)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may 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://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 + Details
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