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Fair Value Measurements (Tables) | 12 Months Ended
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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,
| 2023 |  | 2022
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 debt | 122 |  |  | 415 |
Unrealized gain (loss), included in derivative gain (loss) and other | 1,587 |  |  | (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 |  |  | 0.5 |  | 74.5 | % |  | 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 date | December 7, 2023 |  |
Exercise price | $ | 2.00 |  |  |
Expected term (years) | 5 |  |
Risk-free interest rate | 4.11 | % |  |
Volatility | 92.14 | % |  |
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 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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