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FAIR VALUE MEASUREMENTS - Schedule of Aggregate Fair Value of Warrants (Details) - Level 3 [Member] - Common Stock Warrant [Member] | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 £ / shares | Mar. 31, 2024 $ / shares | Mar. 31, 2025 $ / shares
Convertible Notes Receivable [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock price | £ / shares | £ 0.000035 |  |
Expected term (in years) | 1 year 3 months |  |
Expected volatility | 157.70% |  |
Risk-free interest rate | 4.20% |  |
Expected dividend yield | 0.00% |  |
Junior Note Warrants [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock price |  | $ 0.14 | $ 0.19
Expected term (in years) |  | 4 years 8 months 12 days |
Expected volatility |  | 69.80% |
Risk-free interest rate | 3.90% | 4.20% |
Expected dividend yield | 0.00% | 0.00% |
Junior Note Warrants [Member] | Minimum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Expected term (in years) | 3 years 8 months 12 days |  |
Expected volatility | 62.40% |  |
Junior Note Warrants [Member] | Maximum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Expected term (in years) | 4 years 4 months 24 days |  |
Expected volatility | 65.20% |  |
Indigo Capital Convertible Notes [Member] | Minimum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock price |  |  | 0.19
Expected term (in years) | 11 months 1 day |  |
Indigo Capital Convertible Notes [Member] | Maximum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Stock price |  |  | $ 0.26
Expected term (in years) | 11 months 26 days |  |

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