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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
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 (shares in thousands):
|  |  |  |  |  | Weighted average |
|  | Number of shares |  |  | Exercise price |  |  | Remaining contractual term (years) |
Balance at December 31, 2018 |  |  | 1,407 |  |  | $ | 8.73 |  |  |  |  |
Granted |  |  | 770 |  |  |  | 11.79 |  |  |  |  |
Exercised |  |  | (148 | ) |  |  | 4.59 |  |  |  |  |
Expired/Forfeited |  |  | (163 | ) |  |  | 11.36 |  |  |  |  |
Balance at September 30, 2019 |  |  | 1,866 |  |  | $ | 10.09 |  |  |  | 8.1 |
Vested and exercisable at September 30, 2019 |  |  | 756 |  |  | $ | 8.38 |  |  |  | 6.6 |
Vested and expected to vest at September 30, 2019 |  |  | 1,866 |  |  | $ | 10.09 |  |  |  | 8.1 |

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