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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value of Financial Instruments [Abstract]  
Available-for-Sale Marketable Securities Measured at Fair Value on Recurring Basis

The available-for-sale marketable securities primarily consist of investment-grade, U.S. dollar-denominated fixed and floating-rate debt, measured at fair value on a recurring basis.


   
2023
   
2022
 
(in thousands)
 
Fair Value
   
Level 1
   
Fair Value
   
Level 1
 
                         
Marketable securities
 


   


   
$
569
   
$
569
 
Roll-Forward of Fair Value of Level 3 Warrants
The following is a roll-forward of the fair value of Level 3 warrants:

(in thousands)
  2023  
Balance at December 31, 2021
  $  
October 18, 2022, issuance of Series I warrants
   
18,695
 
Change in fair value
   
(11,827
)
Balance at December 31, 2022
    6,868  
Change in fair value
    755  
Issuance of Common Stock for exercise of Series I warrants
    (7,623 )
October 17, 2023, issuance of Series J warrants
    4,965  
Exercise of Series J warrants
    (536 )
Change in fair value     (1,586 )
Balance at December 31, 2023
 
$
2,483
 
Fair Value Assumptions

Fair values were calculated using the following assumptions:


 
2023
 
2022
 
Risk-free interest rates, adjusted for continuous compounding
   
3.84%-4.92
%
   
3.97
%
Term (years)
   
2.78-3.0
     
6.11
 
Expected volatility
   
141.1%-146.4
%
   
145.3
%
Dates and probability of future equity raises
various
 
various