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Stock Options (Tables)
 6 Months Ended
Jun. 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:

 

 

 

 

 

 

 

Weighted average

 

 

 

Number

of shares

 

 

Exercise price

 

 

Remaining contractual term (years)

 

Balance at December 31, 2018

 

 

1,407,049

 

 

$

8.73

 

 

 

 

 

Granted

 

 

395,485

 

 

 

11.39

 

 

 

 

 

Exercised

 

 

(128,461

)

 

 

4.58

 

 

 

 

 

Expired/Forfeited

 

 

(120,904

)

 

 

10.89

 

 

 

 

 

Balance at June 30, 2019

 

 

1,553,169

 

 

$

9.58

 

 

 

8.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vested and exercisable at June 30, 2019

 

 

701,862

 

 

$

8.19

 

 

 

7.1

 

Vested and expected to vest at June 30, 2019

 

 

1,553,169

 

 

$

9.58

 

 

 

8.1