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Stock Option Plan - Activity Under The Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Stock options available for grant (in shares) | 10,149 | 10,149 | 29,654
Number of Shares |  |  |
Balance at December 31, 2017 (in shares) |  | 3,001,929 |
Options granted (in shares) |  | 73,783 |
Options exercised (in shares) |  | (309,767) |
Options cancelled (in shares) |  | (54,278) |
Balance at September 30, 2018 (in shares) | 2,711,667 | 2,711,667 |
Options vested and exercisable - September 30, 2018 (in shares) | 1,639,606 | 1,639,606 |
Options vested and expected to vest - September 30, 2018 (in shares) | 2,489,664 | 2,489,664 |
Weighted-Average Exercise Price |  |  |
Balance at December 31, 2018 (in dollars per share) |  | $ 4.15 |
Options granted (in dollars per share) | $ 9.88 | 5.51 |
Options exercised (in dollars per share) |  | 4.11 |
Options cancelled (in dollars per share) |  | 4.77 |
Balance at September 20, 2018 (in dollars per share) | 4.12 | 4.12 |
Options vested and exercisable - September 30, 2018 (in dollars per share) | 3.65 | 3.65 |
Options vested and expected to vest - September 30, 2018 (in dollars per share) | $ 4.01 | $ 4.01 |
Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value |  |  |
Weighted-average remaining contractual life, options outstanding (in years) |  | 6 years 9 months 18 days |
Weighted-average remaining contractual life, options vested and exercisable (in years) |  | 6 years |
Weighted-average remaining contractual life, options vested and expected to vest (in years) |  | 6 years 8 months 12 days |
Aggregate intrinsic value at December 31, 2017 |  | $ 3,585 |
Aggregate intrinsic value, options exercised |  | 960 |
Aggregate intrinsic value at September 30, 2018 | $ 23,957 | 23,957 |
Aggregate intrinsic value, options vested and exercisable at September 30, 2018 | 15,271 | 15,271 |
Aggregate intrinsic value, options vested and expected to vest at September 30, 2018 | $ 22,285 | $ 22,285 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -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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