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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation Expense

The following table shows total stock-based compensation expense included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2015 and 2014 (in thousands):

 

 

 

Three months ended

 

 

Nine months ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

Research and development

 

$

1,595

 

 

$

1,182

 

 

$

5,020

 

 

$

3,418

 

General and administrative

 

 

1,233

 

 

 

947

 

 

 

3,644

 

 

 

2,747

 

Total stock-based compensation expense

 

$

2,828

 

 

$

2,129

 

 

$

8,664

 

 

$

6,165