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Fair Value of Financial Instruments (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Fair Value of Financial Instruments [Abstract]    
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):
   September 30, 2023 
   Fair Value   Level 1   Level 2   Level 3 
Assets:                
Money market funds (1)  $1   $
         —
   $
         —
   $
         —
 
                     
Liabilities:                    
Warrant  $1,003   $
—
   $
—
   $1,003 
   December 31, 2022 
   Fair Value   Level 1   Level 2   Level 3 
Assets:                
Money market funds (1)  $73   $
         —
   $
         —
   $
         —
 
Corporate notes and commercial paper  $1,078   $
—
   $1,078   $
—
 
                     
Liabilities:                    
Warrants  $2,079   $
—
   $
—
   $2,079 
(1) Amounts are included in cash and cash equivalents on the condensed consolidated balance sheets.

 The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2022 and 2021 and the basis for that measurement (in thousands):
   December 31, 2022 
   Fair Value   Level 1   Level 2   Level 3 
Assets:                
Money market funds (1)  $73   $
—
   $
—
   $
—
 
Corporate notes and commercial paper  $1,078   $
—
   $1,078   $
—
 
                     
Liabilities:                    
Warrant liability  $2,079   $
—
   $
—
   $2,079 
   December 31, 2021 
   Fair Value   Level 1   Level 2   Level 3 
Money market funds (1)  $1,159   $1,159   $
—
   $
—
 
Corporate notes and commercial paper  $12,195   $
—
   $12,195   $
—
 
(1)Included in cash and cash equivalents
Schedule of Determination of Fair Value for its Financial Assets The following tables represents the Company’s determination of fair value for its financial assets (cash equivalents and investments) (in thousands):
   September 30, 2023 
       Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
Cash and cash equivalents  $689   $         —   $
         —
   $689 
   December 31, 2022 
       Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
Cash and cash equivalents  $1,828   $
          —
   $
         —
   $1,828 
Short-term investments   1,103    
—
    (25)   1,078 
   $2,931   $
—
   $(25)  $2,906 
 The following table represents the Company’s determination of fair value for its financial assets (cash equivalents and investments) (in thousands):
   December 31, 2022 
       Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
Cash and cash equivalents  $1,828   $
—
   $
—
   $1,828 
Short-term investments   1,103    
—
    (25)   1,078 
   $2,931   $
—
   $(25)  $2,906 
   December 31, 2021 
       Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
Cash and cash equivalents  $5,893   $
—
   $
—
   $5,893 
Short-term investments   9,276    
—
    (9)   9,267 
Long-term investments   2,935    
—
    (7)   2,928 
   $18,104   $
—
   $(16)  $18,088