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Stock Options (Tables)
 6 Months Ended
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