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Fair Value Measurement of Assets and Liabilities (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on Recurring Basis
The following table summarizes 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 December 31, 2021 and 2020 (in thousands):

December 31, 2021December 31, 2020
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$926 $926 $— $4,898 $4,898 $— 
        Total liabilities$926 $926 $— $4,898 $4,898 $— 
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:
December 31, 2021December 31, 2020
Volatility50 %50 %
Stock price
$5.83 per share
$15.47 per share
Credit spread15.93 %19.25 %
Term3.34 years4.34 years
Dividend yield— %— %
Risk-free rate1.02 %0.30 %
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 twelve months ended December 31, 2021 (in thousands):
Balance as of
December 31, 2020
AdditionsConversionsChange in fair valueBalance as of
December 31, 2021
Liabilities:
Interest make-whole payment$4,898 $— $(146)$(3,826)$926