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Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
Stock-based Compensation  
Summary of stock option activity

                                                                                                               

                                                                                                                       

 

Shares

 

Weighted average
exercise price

 

Outstanding at January 1, 2017

 

784,011

 

$

10.70

 

Options granted

 

192,700

 

15.96

 

Options exercised

 

 

 

Options cancelled

 

 

 

 

 

 

 

 

 

Outstanding at June 30, 2017

 

976,711

 

$

11.74

 

 

 

 

 

 

 

 

Exercisable at June 30, 2017

 

153,088

 

$

13.06

 

 

Schedule of stock-based compensation expense

Stock-based compensation expense during the three and six months ended June 30, 2017 and 2016 was as follows (in thousands):

 

 

 

Three Months
Ended June 30,

 

Six Months
Ended June 30,

 

 

 

2017

 

2016

 

2017

 

2016

 

Stock-based compensation expense by type of award:

 

 

 

 

 

 

 

 

 

Stock options

 

$

527

 

$

 

$

981

 

$

 

Restricted stock

 

149

 

 

297

 

 

 

 

 

 

 

 

 

 

 

 

Total stock-based compensation expense

 

$

676

 

$

 

$

1,278

 

$

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Effect of stock-based compensation expense by line item:

 

 

 

 

 

 

 

 

 

Research and development

 

$

168

 

$

 

$

305

 

$

 

General and administrative

 

508

 

 

 

973

 

 

 

 

 

 

 

 

 

 

 

 

Total stock-based compensation expense included in net loss

 

$

676

 

$

 

$

1,278

 

$

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Schedule of unrecognized stock-based compensation expense

Unrecognized stock-based compensation expense as of June 30, 2017 was as follows (in thousands):

 

 

 

Unrecognized
stock
compensation
expense

 

Weighted
average
remaining
period
(in years)

 

Stock options

 

$

5,916

 

2.44

 

Restricted stock

 

1,061

 

1.99

 

 

 

 

 

 

 

Total

 

$

6,977

 

2.38