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Stock Options (Tables)
 3 Months Ended
Mar. 31, 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:

 

 

 

Number

of shares

 

 

Weighted

average

exercise

price

 

 

Weighted

average

remaining contractual term

 

Balance at December 31, 2018

 

 

1,407,049

 

 

$

8.73

 

 

 

8.1

 

Granted

 

 

395,485

 

 

 

11.39

 

 

 

9.5

 

Exercised

 

 

(77,994

)

 

 

2.96

 

 

 

4.5

 

Expired/Forfeited

 

 

(63,891

)

 

 

11.19

 

 

 

0.1

 

Balance at March 31, 2019

 

 

1,660,649

 

 

$

9.54

 

 

 

8.3

 

Vested and exercisable at March 31, 2019

 

 

645,179

 

 

$

7.97

 

 

 

7.2

 

Vested and expected to vest at March 31, 2019

 

 

1,660,649

 

 

$

9.54

 

 

 

8.3