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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
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 six months ended June 30, 2018 and 2017 (in thousands):

 

 

 

Three Months Ended

 

 

Six Months Ended

 

 

 

June 30,

 

 

June 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Research and development

 

$

2,120

 

 

$

1,218

 

 

$

3,879

 

 

$

2,436

 

General and administrative

 

 

1,394

 

 

 

746

 

 

 

2,685

 

 

 

2,315

 

Total stock-based compensation expense

 

$

3,514

 

 

$

1,964

 

 

$

6,564

 

 

$

4,751