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

 

 

638,300

 

 

 

10.75

 

 

 

9.81

 

Exercised

 

 

(52,970

)

 

 

1.96

 

 

 

3.92

 

Expired/Forfeited

 

 

(53,499

)

 

 

9.55

 

 

 

0.06

 

Balance at March 31, 2018

 

 

1,735,458

 

 

$

8.49

 

 

 

8.57

 

Vested and exercisable at March 31, 2018

 

 

499,046

 

 

$

2.25

 

 

 

6.72

 

Vested and expected to vest at March 31, 2018

 

 

1,735,458

 

 

$

8.49

 

 

 

8.57