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Stock-Based Awards (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense Related to Stock Options and Restricted Common Stock

The Company recorded stock-based compensation expense related to stock options and restricted common stock in the following expense categories within its condensed consolidated statements of operations for the three months ended March 31, 2018 and 2017 as follows:

 

     Three Months Ended March 31,  
     2018      2017  
     (in thousands)  

Research and development

    $ 1,572      $ 856  

General and administrative

      894        1,145  
  

 

 

     

 

 

  
   $ 2,466      $ 2,001