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Fair Value of Financial Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicates the level of the fair value hierarchy utilized to determine such fair values (in thousands):

 

    Fair Value Measurements as of December 31, 2017 Using:  
    Level 1     Level 2     Level 3     Total  
Liabilities:                                
Warrant liability   $ —     $ —     $ 520     $ 520  

 

    Fair Value Measurements as of September 30, 2018 Using:  
    Level 1     Level 2     Level 3     Total  
Liabilities:                                
Warrant liability   $ —     $ —     $ 1,577     $ 1,577  
Schedule of Aggregate Fair Values of the Warrant Liability

The following table provides a roll forward of the aggregate fair values of the Company’s warrant liability, for which fair value is determined using Level 3 inputs

 

   

Period from

April 27, 2017 (inception) to December 31, 2017

     Nine months ended September 30, 2018  
Balance as of the beginning of the period   $ —     $ 520  
Initial fair value of warrant liability     479       —  
Change in fair value     41       1,057  
Balance as of the end of the period   $ 520     $ 1,577