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Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Stock-based compensation |  |
Options Available for Grant, Outstanding, Beginning balance | 83,929 |
Options Available for Grant, Options authorized | 1,084,516 |
Options Available for Grant, RSUs granted | (60,450) |
Options Available for Grant, RSUs cancelled/forfeited | 1,900 |
Options Available for Grant, Options granted | (310,715) |
Options Available for Grant, Options cancelled/forfeited | 28,834.00 |
Options Available for Grant, Outstanding, Ending balance | 826,988 | 83,929
Number of Options, Outstanding, Beginning balance | 1,593,195 |
Number of Options, Options granted | 310,715 |
Number of Options, Options exercised | (190,800) |
Number of Options, Options cancelled/forfeited | (30,707) |
Number of Options, Outstanding, Ending balance | 1,696,187 | 1,593,195
Number of Options, exercisable | 746,702 |
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance | $ / shares | $ 8.88 |
Weighted - Average Exercise Price Per Share, Options granted | $ / shares | 8.79 |
Weighted - Average Exercise Price Per Share, Options exercised | $ / shares | 4.69 |
Weighted - Average Exercise Price Per Share, Options cancelled/forfeited | $ / shares | 7.97 |
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance | $ / shares | 7.28 | $ 8.88
Weighted - Average Exercise Price Per Share, Options exercisable | $ / shares | $ 5.85 |
Weighted - Average Remaining Contractual Life, Options outstanding | 7 years 2 months 12 days | 6 years 7 months 6 days
Weighted - Average Remaining Contractual Life, Options exercisable | 4 years 9 months 18 days |
Aggregate Intrinsic Value, Options outstanding | $ | $ 3,204 | $ 1,997
Aggregate Intrinsic Value, Options exercised | $ | 815 |
Aggregate Intrinsic Value, Options exercisable | $ | $ 2,355 |
Adjustment |  |
Stock-based compensation |  |
Options Available for Grant, Outstanding, Beginning balance | (1,026) |
Options Available for Grant, Outstanding, Ending balance |  | (1,026)
Number of Options, Outstanding, Beginning balance | 13,784 |
Number of Options, Outstanding, Ending balance |  | 13,784
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance | $ / shares | $ 4.54 |
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance | $ / shares |  | $ 4.54

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- Definition Share based compensation arrangement by share based payment award number of shares available for grant cancelled or forfeited in period other than options. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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