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Stock Incentive Plans and Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity during the six months ended June 30, 2017 and 2016: 

 

 

 

Number of Common Shares

 

 

Weighted-

 

 

 

Options

 

 

 

 

 

 

Available

 

 

Average

 

 

 

Outstanding

 

 

Exercisable

 

 

for Grant

 

 

Exercise Price

 

2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at December 31, 2016

 

 

3,402,481

 

 

 

411,029

 

 

 

274,596

 

 

$

9.02

 

Authorized

 

 

—

 

 

 

 

 

 

 

889,259

 

 

 

—

 

Granted

 

 

977,570

 

 

 

 

 

 

 

(977,570

)

 

 

14.25

 

Exercised

 

 

(19,989

)

 

 

 

 

 

 

—

 

 

 

7.70

 

Cancelled

 

 

(41,459

)

 

 

 

 

 

 

41,459

 

 

 

11.94

 

Balance at June 30, 2017

 

 

4,318,603

 

 

 

391,040

 

 

 

227,744

 

 

$

10.19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at December 31, 2015

 

 

2,419,529

 

 

 

724,529

 

 

 

837,635

 

 

$

8.16

 

Authorized

 

 

—

 

 

 

 

 

 

 

874,709

 

 

 

—

 

Granted

 

 

223,070

 

 

 

 

 

 

 

(223,070

)

 

 

11.19

 

Exercised

 

 

(294,956

)

 

 

 

 

 

 

—

 

 

 

11.21

 

Cancelled

 

 

(10,000

)

 

 

 

 

 

 

10,000

 

 

 

9.33

 

Balance at June 30, 2016

 

 

2,337,643

 

 

 

429,573

 

 

 

1,499,274

 

 

$

8.75