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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 and 2013 (in thousands):

 

 

Three months ended

 

 

Nine months ended

 

 

September 30,

 

 

September 30,

 

 

2014

 

 

2013

 

 

2014

 

 

2013

 

Costs and expenses:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development

$

1,182

 

 

$

732

 

 

$

3,418

 

 

$

2,140

 

General and administrative

 

947

 

 

 

659

 

 

 

2,747

 

 

 

1,958

 

Total stock-based compensation expense

$

2,129

 

 

$

1,391

 

 

$

6,165

 

 

$

4,098