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Stock Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2015
Text Block [Abstract]  
Schedule of Stock Option Activity

The following table summarizes stock option activity during the nine months ended September 30, 2015:

 

 

Number of

Shares

 

 

Weighted

Average

Exercise Price

 

 

Weighted

Average

Remaining

Contractual Life

in Years

 

 

Total Aggregate

Intrinsic Value

 

Outstanding at December 31, 2014

 

709,136

 

 

$

2.29

 

 

 

9.73

 

 

$

2,522

 

Options granted

 

849,791

 

 

 

8.22

 

 

 

 

 

 

 

 

 

Options exercised

 

(47,648

)

 

 

2.44

 

 

 

 

 

 

 

 

 

Options canceled

 

(103,813

)

 

 

2.58

 

 

 

 

 

 

 

 

 

Outstanding at September 30, 2015

 

1,407,466

 

 

 

5.85

 

 

 

9.04

 

 

 

9,898

 

Vested and expected to vest at September 30, 2015

 

1,407,466

 

 

 

5.85

 

 

 

9.04

 

 

 

9,898

 

Vested at September 30, 2015

 

417,594

 

 

 

4.06

 

 

 

8.46

 

 

 

3,649

 

Exercisable at September 30, 2015

 

1,116,205

 

 

$

5.11

 

 

 

8.99

 

 

$

8,522

 

 

Summary of Stock-based compensation expense recognized for restricted shares stock options and ESPP

 

Stock-based compensation expense recognized for restricted shares, stock options, and the ESPP has been reported in the statements of operations as follows (in thousands):

 

 

Three months ended

September 30,

 

 

Nine months ended

September 30,

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

Research and development

$

324

 

 

$

17

 

 

$

1,260

 

 

$

21

 

General and administrative

 

442

 

 

 

32

 

 

 

985

 

 

 

36

 

Total

$

766

 

 

$

49

 

 

$

2,245

 

 

$

57