Public Warrants

The fair value of the Public Warrants is based on quoted market prices and is classified as a Level 1 financial instrument.

Private Placement Warrants

The fair value of the Private Warrants is estimated using the Black-Scholes model with inputs that include the Company’s stock price in an actively traded market, making this fair value classified as a Level 2 financial instrument. The other significant assumptions used in the model are the exercise price, expected term, volatility, interest rate, and dividend yield.

Contingent Earnout Liability

The estimated fair value of the contingent earnout liability was determined using a Monte Carlo simulation using a distribution of potential outcomes on a monthly basis over the Earnout Period (Note 3) prioritizing the most reliable information available. The assumptions utilized in the calculation are based on the achievement of certain stock price milestones, including the current price of the Company’s common stock, expected volatility, risk-free rate, expected term and dividend rate.

EIB Warrant Liabilities

The warrant liability in the tables above consisted of the fair value of warrants to purchase the Company’s common stock at a price of $0.0001 per share (or redeem for cash) and preferred stock and was based on the significant inputs not observable in the market, which prior to the Merger represented a Level 3 measurement within the fair value hierarchy. The Company’s valuation of the stock warrants utilized the Black-Scholes option-pricing model, which incorporates assumptions and estimates to value the stock warrants. Changes in the fair value of the stock warrants are recognized in Other income (expense), net in the Consolidated Statements of Operations.

The quantitative inputs utilized in the fair value measurement of the stock warrant liability include the fair value per share of the Company’s common stock, the remaining contractual term of the warrants, risk-free interest rate, expected dividend yield and expected volatility of the price of the Company’s common stock. Prior to the Merger, the Company determined the fair value per share of the Company’s common and preferred stock using a hybrid valuation method that utilized a combination of an option pricing model method and the Probability-Weighted Expected Return Method (“PWERM”). The PWERM is a scenario-based methodology that estimates the fair value of equity securities based upon an analysis of future values, assuming various outcomes. As the probability of the Merger closing increased, the fair value of the EIB warrant liability increased as of the date of the exercise. The risk-free interest rate is based on a treasury instrument for which the term is consistent with the expected life of the warrants. As there was no public market for the Company’s common and preferred stock, the Company determined the expected volatility for warrants granted based on an analysis of reported data for a peer group of companies.

After the Merger, the EIB warrant liabilities moved from Level 3 to Level 2, as a result of the Company’s common stock now being traded on the New York Stock Exchange, until the date of settlement.

During the year ended December 31, 2021, the Company issued 32,412 warrants at a fair value of $308 to Silicon Valley Bank with an exercise price of $1.60. The warrants allow the holder to acquire the Company’s common stock. Silicon Valley Bank exercised the Series C warrants and they were converted into common stock upon the Closing.

Certain holders of Series C preferred stock exercised their warrants at a nominal amount to purchase 146,919 shares of the Company’s common stock at a fair value of $891 during the year ended December 31, 2021.

Based on the recent rounds of debt financing during the years ended December 31, 2021 and 2020 and the terms of those debt agreements, current market conditions and the Company’s financial condition, the carrying amounts for Long-term debt and Convertible notes payable approximate fair value. The carrying amounts reported on the Consolidated Balance Sheets of other assets and liabilities which are considered to be financial instruments approximate fair value based on their short-term nature and current market indicators are classified as Level 3.

Warrant Equity

The warrant liability in the table above classified as equity was recorded at fair value on the date of issuance and is not remeasured. The fair value of warrants was based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The Company’s valuation of the stock warrants utilized the Black-Scholes option-pricing model, which incorporates assumptions and estimates to value the stock warrants.