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Stock Options (Tables) | 9 Months Ended
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Sep. 30, 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 |  |  | 998,800 |  |  |  | 9.90 |  |  |  | 7.33 |
Exercised |  |  | (297,719 | ) |  |  | 2.07 |  |  |  | 0.91 |
Expired/Forfeited |  |  | (425,054 | ) |  |  | 11.87 |  |  |  | 0.04 |
Balance at September 30, 2018 |  |  | 1,479,654 |  |  | $ | 8.60 |  |  |  | 8.26 |
Vested and exercisable at September 30, 2018 |  |  | 488,427 |  |  | $ | 5.83 |  |  |  | 6.91 |
Vested and expected to vest at September 30, 2018 |  |  | 1,479,654 |  |  | $ | 8.60 |  |  |  | 8.26 |

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