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Fair Value Measurement of Assets and Liabilities
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurement of Assets and Liabilities Fair Value Measurement of Assets and Liabilities
Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or liability. Each fair value measurement is classified into one of the following levels based on the information used in the valuation:
Level 1:    Observable inputs such as quoted prices in active markets.
Level 2:    Inputs, other than quoted prices in active markets, that are observable either directly or indirectly.
Level 3:    The fair market value for level 3 securities may be highly sensitive to the use of unobservable inputs and subjective assumptions. Generally, changes in significant unobservable inputs may result in significantly lower or higher fair value measurements.
The Company’s financial instruments measured at fair value were $0 and less than $0.1 million as of September 30, 2023 and December 31, 2022 respectively.
The fair value of the interest make-whole payment derivative liability was determined using a Monte Carlo model using the following key assumptions:
September 30, 2023December 31, 2022
Volatility68 %50 %
Stock price
$0.42 per share
$0.84 per share
Credit spread41.61 %56.52 %
Term1.59 years2.34 years
Dividend yield— %— %
Risk-free rate5.21 %4.35 %

There was no material change in the fair value of the interest make-whole liability for both the three and nine months ended September 30, 2023. For the three and nine months ended September 30, 2022, the Company recorded no gain or loss and a $0.9 million gain, respectively, as a result of the change in the fair value of the interest make-whole liability.

The Company reviews the fair value hierarchy classification of its financial instruments measured at fair value each reporting period. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. There have been no transfers of assets or liabilities between fair value measurement classifications during the nine months ended September 30, 2023 or 2022.

Other Financial Instruments
The carrying values of the Company’s other financial assets and liabilities approximate their fair values because of their short-term nature, with the exception of the 3.25% convertible senior notes due 2025 (the “2025 Notes”, see “Note 4, Debt”). The 2025 Notes are carried at amortized cost, adjusted for changes in the fair value of the embedded derivative.