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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
The Company’s financial assets and liabilities measured at fair value on a recurring basis and the level of inputs used for such measurements were as follows (in thousands):
 
    
Fair Value (in thousands) Measured as of December 31, 2021 Using:
 
    
Adjusted Cost
    
Unrealized
losses
   
Fair Value
    
Cash and
Cash
Equivalent
    
Marketable
Securities
 
Assets
             
Level 1
             
Money market funds
   $ 4,863    $ —     $ 4,863    $ 4,863    $ —  
Level 2
             
Asset-backed securities
   $ 26,491    $ (68   $ 26,423    $ —      $ 26,423
Corporate bonds
     48,643      (150     48,493      —          48,493
Commercial paper
     45,145      —         45,145      —          45,145
U.S. Government securities
     29,936      (173     29,763      —          29,763
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Total financial assets
   $ 155,078    $ (391   $ 154,687    $ 4,863    $ 149,824
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Liabilities
             
Level 2
             
Private placement warrant liability
   $ —      $ —     $ 155    $ —      $ —  
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Total financial liabilities
   $ —      $ —     $ 155    $ —      $ —  
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Liabilities
             
Level 3
             
Common stock and series A preferred stock warrant liability
   $ —      $ —     $ 93    $ —      $ —  
Embedded derivative liability
     —          —         17      —          —    
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Total financial liabilities
   $ —      $ —     $ 110    $ —      $ —  
  
 
 
    
 
 
   
 
 
    
 
 
    
 
 
 
Summary of the Changes in Fair Value of Level 3 Financial Instruments
The following table presents a summary of the changes in fair value of the Company’s Level 3 financial instruments for the year ended December 31, 2021 (in thousands):
 
    
Embedded
Derivative
    
Common Stock and
Series A Preferred Stock
Warrant Liability
    
Total
 
Balance at December 31, 2020
   $ 17    $ 93    $ 110
(Gain) loss in fair value included in other income (expense, net)
     (17      (93      (110
  
 
 
    
 
 
    
 
 
 
Balance at December 31, 2021
   $ —      $ —      $ —  
  
 
 
    
 
 
    
 
 
 
 
    
Embedded
Derivative
    
Common Stock and
Series A Preferred Stock
Warrant Liability
    
Total
 
Balance at December 31, 2019
   $ —      $ —      $ —  
Initial fair value of embedded derivative
     1,520      —          1,520
(Gain)/loss in fair value included in other income (expense, net)
     (1,503      93      (1,410
  
 
 
    
 
 
    
 
 
 
Balance at December 31, 2020
   $ 17    $ 93    $ 110
  
 
 
    
 
 
    
 
 
 
Key Inputs into the Black-Sholes Option Pricing Model
The key inputs into the Black-Scholes option-pricing model for the common stock and series A preferred stock warrant liability valued at December 31, 2020 are as follows:
 
    
December 31, 2020
 
Expected term (years)
     5.8  
Expected volatility
     45.6
Risk-free interest rate
     0.4
Dividend yield
     —  
Exercise price
   $ 15.03