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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2023
Fair Value of Financial Instruments [Abstract]  
Fair Value of Financial Instruments
Note 6—Fair Value of Financial Instruments

The Company’s financial instruments consist of cash and cash equivalents, marketable securities, and warrants.

Pursuant to the requirements of ASC Topic 820 “Fair Value Measurement,” the Company’s financial assets and liabilities measured at fair value on a recurring basis are classified and disclosed in one of the following three categories:

Level 1 - Financial instruments with unadjusted quoted prices listed on active market exchanges.

Level 2 - Financial instruments lacking unadjusted, quoted prices from active market exchanges, including over-the-counter traded financial instruments. The prices for the financial instruments are determined using prices for recently traded financial instruments with similar underlying terms as well as directly or indirectly observable inputs, such as interest rates and yield curves that are observable at commonly quoted intervals.

Level 3 - Financial instruments that are not actively traded on a market exchange. This category includes situations where there is little, if any, market activity for the financial instrument. The prices are determined using significant unobservable inputs or valuation techniques.


All cash equivalents and marketable securities are considered Level 1 measurements for all periods presented.



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
 



The fair value of the Company’s common stock warrant liability related to the investor warrants issued in the October 2023 and October 2022 public offerings, were calculated using a Monte Carlo valuation model and were classified as Level 3 in the fair value hierarchy.

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 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
 



A significant change in the inputs used for the Monte Carlo valuation models,  such as the expected volatility, risk-free interest rate, or probability of future equity financings, in isolation, would result in significantly higher or lower fair value measurements. In combination, changes in these inputs could result in a significantly higher or lower fair value measurement if the input changes were to be aligned or could result in a minimally higher or lower fair value measurement if the input changes were of a compensating nature.