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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Text Block [Abstract]  
Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:

 

     December 31,  
     2018      2017  

Tax incentive refund

    $ 1,325      $ —    

Prepaid research and development costs

      981        163  

Prepaid insurance

      316        —    

Interest income receivable

      220        —    

Prepaid rent

      81        122  

Other current assets

      795        60  
  

 

 

     

 

 

  
   $ 3,718      $ 345