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Marketable Securities (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Summary of Amortized Cost Gross Unrealized Holding Gains or Losses and Fair Value of Marketable Securities
All marketable securities were considered
available-for-sale
as of September 30, 2023 and December 31, 2022. The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s
marketable
securities by major security type are summarized in the tables below (in thousands):
 
    
September 30, 2023
 
    
Amortized

Cost Basis
    
Unrealized

Gains
    
Unrealized

Losses
    
Fair

Value
 
Available-for-sale
securities
           
U.S. treasuries
   $ 4,469      $ —        $ (13    $ 4,456  
Commercial paper
     7,942        —          (5      7,937  
U.S. agency securities
     36,700        —          (74      36,626  
Asset-backed securities
     1,982        —          (3      1,979  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
available-for-sale
securities
   $ 51,093      $ —        $ (95    $ 50,998  
  
 
 
    
 
 
    
 
 
    
 
 
 
 
    
December 31, 2022
 
    
Amortized

Cost Basis
    
Unrealized

Gains
    
Unrealized

Losses
   
Fair

Value
 
Available-for-sale
securities
          
U.S. treasuries
   $ 65,807      $ —        $ (416   $ 65,391  
Commercial paper
     115,381        13        (333     115,061  
U.S. agency securities
     53,767        15        (327     53,455  
Asset-backed securities
     1,914        —          —         1,914  
  
 
 
    
 
 
    
 
 
   
 
 
 
Total
available-for-sale
securities
   $ 236,869      $ 28      $ (1,076   $ 235,821  
  
 
 
    
 
 
    
 
 
   
 
 
 
    
December 31, 2022
 
    
Amortized

Cost Basis
    
Unrealized

Gains
    
Unrealized

Losses
    
Fair

Value
 
Available-for-sale
securities
           
U.S. treasuries
   $ 65,807      $ —        $ (416    $ 65,391  
Commercial paper
     115,381        13        (333      115,061  
U.S. agency securities
     53,767        15        (327      53,455  
Asset-backed securities
     1,914        —          —          1,914  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
available-for-sale
securities
   $ 236,869      $ 28      $ (1,076    $ 235,821