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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of rollforward of assets and liabilities measured at fair value
The following table presents a rollforward for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):
Year Ended December 31,
20232022
Balances at beginning of period$(122)$(880)
Issuance of embedded derivatives within the 2023 Funding Agreement(292)— 
Derivative adjustment related to debt conversions— 1,148 
Derivative adjustment related to extinguishment of debt122 415 
Unrealized gain (loss), included in derivative gain (loss) and other1,587 (805)
Balances at end of period$1,295 $(122)
Schedule of fair value measurement inputs The total fair value of these shares was $19.0 million and computed using the following assumptions on the transaction date:
Underlying Stock Price and
Exercise Price
Term (Years)
Volatility
Risk-Free Interest Rate
Fair Value of Consideration
$1.13 0.574.5 %5.52 %
The fair value of 5.0 million of the warrants, which is the portion that vested immediately on the effective date of the agreement, was estimated using the Black-Scholes option pricing model with the following assumptions on the valuation date of December 7, 2023.

Number of warrants (in millions)
5.0 
Grant dateDecember 7, 2023
Exercise price$2.00 
Expected term (years)5
Risk-free interest rate4.11 %
Volatility92.14 %
Black-Scholes fair value per share$1.00 
Total fair value (in millions)
$5.0 
The Monte Carlo simulation was computed using the following assumptions:
Risk-Free Interest Rate
Stock Price Volatility
Market Price of Common Stock
Fair Value of RSUs
4.73 %80.00 %$1.29