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Stock Options (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Outstanding Stock Option Activity | The following table summarizes the outstanding stock option activity during the periods indicated:
|  | Number of shares |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |
Balance at December 31, 2017 |  |  | 1,203,627 |  |  | $ | 7.06 |  |  |  | 8.10 |
Granted |  |  | 638,300 |  |  |  | 10.75 |  |  |  | 9.81 |
Exercised |  |  | (52,970 | ) |  |  | 1.96 |  |  |  | 3.92 |
Expired/Forfeited |  |  | (53,499 | ) |  |  | 9.55 |  |  |  | 0.06 |
Balance at March 31, 2018 |  |  | 1,735,458 |  |  | $ | 8.49 |  |  |  | 8.57 |
Vested and exercisable at March 31, 2018 |  |  | 499,046 |  |  | $ | 2.25 |  |  |  | 6.72 |
Vested and expected to vest at March 31, 2018 |  |  | 1,735,458 |  |  | $ | 8.49 |  |  |  | 8.57 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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