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Fair Value of Financial Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 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, 2018 Using:  
    Level 1     Level 2     Level 3     Total  
Liabilities:                                
Warrant liability   $ —     $ —     $ —     $ —  

 

    Fair Value Measurements as of December 31, 2017 Using:  
    Level 1     Level 2     Level 3     Total  
Liabilities:                                
Warrant liability   $ —     $ —     $ 520     $ 520  
Schedule of Aggregate Fair Values of Warrant Liability, Unobservable Input Reconciliation

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:

 

    Year ended
December 31,
2018		     Period from
April 27, 2017 (inception) to December 31,
2017		  
Balance as of the beginning of the period   $ 520       —  
Initial fair value of warrant liability     —       479  
Change in fair value     2,583       41  
Warrant liability reclassified to additional paid-in-capital     (3,103 )     —  
Balance as of the end of the period   $ —       520