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Stock Options (Tables) | 6 Months Ended
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Jun. 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 |  |  | 963,800 |  |  |  | 9.88 |  |  |  | 7.79 |
Exercised |  |  | (136,094 | ) |  |  | 2.20 |  |  |  | 1.43 |
Expired/Forfeited |  |  | (75,458 | ) |  |  | 10.43 |  |  |  | 0.04 |
Balance at June 30, 2018 |  |  | 1,955,875 |  |  | $ | 8.66 |  |  |  | 6.73 |
Vested and exercisable at June 30, 2018 |  |  | 867,417 |  |  | $ | 7.07 |  |  |  | 3.76 |
Vested and expected to vest at June 30, 2018 |  |  | 1,955,875 |  |  | $ | 8.66 |  |  |  | 6.73 |

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