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Fair Value Measurement of Assets and Liabilities (Tables)
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on Recurring Basis The following tables summarize the Company’s financial instruments measured at fair value on a recurring basis in accordance with the authoritative guidance for fair value measurements as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Total Fair ValueLevel 3Level 1Total Fair ValueLevel 3Level 1
Assets
Cash equivalents
Money market funds$126 $— $126 $126 $— $126 
Total assets$126 $— $126 $126 $— $126 
Liabilities
2025 Notes
     Interest make-whole payment$317 $317 $— $926 $926 $— 
        Total liabilities$317 $317 $— $926 $926 $— 
Schedule of Fair Value Valuation Model and Assumptions
The fair value of the interest make-whole payment derivative liability was determined using a Monte Carlo model with the following key assumptions:
March 31, 2022December 31, 2021
Volatility50 %50 %
Stock price
$4.05 per share
$5.83 per share
Credit spread15.53 %15.93 %
Term3.09 years3.34 years
Dividend yield— %— %
Risk-free rate2.45 %1.02 %
Summary of Changes in Fair Value of Level 3 Liabilities The following table sets forth a summary of changes in the fair value of Level 3 liabilities for the three months ended March 31, 2022 (in thousands):
Balance as of
December 31, 2021
AdditionsConversionsChange in fair valueBalance as of
March 31, 2022
Liabilities:
Interest make-whole payment$926 $— $— $(609)$317