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FAIR VALUE MEASUREMENTS - Schedule Of Aggregate Fair Value Of Warrants (Details) - Level 3 [Member] - Common Stock Warrant [Member] | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2025 $ / shares | Jun. 30, 2024 $ / shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 $ / shares | Jun. 30, 2025 £ / shares
Junior Note Warrants [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price | $ 0.35 |  |  |  |
Expected volatility |  |  |  | 66.30% |
Risk-free interest rate | 3.70% |  |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
Junior Note Warrants [Member] | Minimum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price |  | $ 0.03 | $ 0.03 | $ 0.15 |
Expected term (in years) | 3 years 4 months 24 days | 4 years 4 months 24 days | 3 years 10 months 24 days | 4 years 10 months 24 days |
Expected volatility | 66.20% | 58.90% | 58.90% |  |
Risk-free interest rate |  | 4.20% | 3.60% | 3.80% |
Junior Note Warrants [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price |  | $ 0.14 | $ 0.67 | $ 0.18 |
Expected term (in years) | 4 years 1 month 6 days | 4 years 8 months 12 days | 4 years 10 months 24 days | 5 years |
Expected volatility | 70.80% | 69.80% | 79.60% |  |
Risk-free interest rate |  | 4.30% | 4.30% | 4.10% |
August 2024 Convertible Note Derivative Liability [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Expected dividend yield |  |  | 0.00% |  |
August 2024 Convertible Note Derivative Liability [Member] | Minimum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price |  |  | $ 0.51 |  |
Expected term (in years) |  |  | 4 months 6 days |  |
Expected volatility |  |  | 253.00% |  |
Risk-free interest rate |  |  | 4.60% |  |
August 2024 Convertible Note Derivative Liability [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price |  |  | $ 1.82 |  |
Expected term (in years) |  |  | 5 months 15 days |  |
Expected volatility |  |  | 285.40% |  |
Risk-free interest rate |  |  | 5.00% |  |
Convertible Notes Receivable [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Expected dividend yield | 0.00% |  |  |  |
Convertible Notes Receivable [Member] | Minimum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price | £ / shares |  |  |  |  | £ 0.000038
Expected term (in years) | 1 year |  |  |  |
Expected volatility | 157.70% |  |  |  |
Risk-free interest rate | 3.80% |  |  |  |
Convertible Notes Receivable [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Stock price | £ / shares |  |  |  |  | £ 0.000048
Expected term (in years) | 1 year 3 months |  |  |  |
Expected volatility | 188.10% |  |  |  |
Risk-free interest rate | 4.20% |  |  |  |

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