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Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Nov. 30, 2022 | Dec. 31, 2023 | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2021
Prepaid Expenses and Other Current Assets [Line Items] |  |  |  |  |  |  |  |  |
Credit losses on receivables |  |  |  |  | $ 3,200 |  | $ 2,400 |  |
Expected credit losses for prepaid expenses |  |  | $ 11,200 |  |  |  | 4,100 |  |
Prepaid expenses |  |  | 12,094 | [1] | 7,498 | [2] | 7,386 | [1],[2] |
Interests-free loan | $ 6,000 | $ 6,000 |  |  |  |  |  |  |
Receivables |  |  | 7,777 |  |  |  | 5,333 |  |
Amount of individual prepayment paid |  | 2,000 |  |  |  |  |  |  |
Consulting expenses |  |  | 800 |  |  |  |  |  |
Reversed credit losses |  |  | 1,200 |  |  |  |  |  |
NWTN [Member] |  |  |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  | 7,300 |  | 7,200 |  |
Interests-free loan | $ 1,000 | $ 1,000 |  |  |  |  |  |  |
Equity interests | 4.30% | 4.30% |  |  |  |  |  |  |
VAT [Member] |  |  |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |  |  |  |  |  |  |  |
Credit losses on receivables |  |  |  |  | $ 600 |  | $ 600 |  |
Third Party [Member] |  |  |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |  |  |  |  |  |  |  |
Receivables |  |  | $ 7,000 |  |  |  |  |  |
Third Party [Member] | NWTN [Member] |  |  |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |  |  |  |  |  |  |  |
Equity interests |  | 0.40% |  |  |  |  |  |  |
[1] | Prepaid expenses primarily consisted of directors’ and officers’ insurance expenses to be amortized within a year and prepaid commission expenses for financing and marketing services, advance payment for the potential investment or acquisition as of December 31, 2024 and 2023. As of December 31, 2023, the Group recorded expected credit losses for the prepaid expenses of US$11.2 million based on the management’ estimation of the recoverability, considering the suspension of certain business operations and the uncertainty regarding the ability to reclaim the prepaid expenses. As of December 31, 2024, US$4.1 million of such prepaid expenses were written off based on the management’ estimation of the collectability of the prepaid expenses. Meanwhile, the Group recorded expected credit losses for prepaid expenses of US$7.2 million based on the management’ estimation of the recoverability.
[2] | Prepaid expenses primarily consisted of directors’ and officers’ insurance expenses to be amortized within a year and prepaid commission expenses for financing and marketing services, advance payment for the potential investment or acquisition as of June 30, 2025 and December 31, 2024. As of December 31, 2023, the Group recorded impairment losses for the prepaid expenses of US$11.2 million based on the management’ estimation of the recoverability, considering the suspension of certain business operations and the uncertainty regarding the ability to reclaim the prepaid expenses. As of June 30, 2025 and December 31, 2024, the Group recorded impairment losses for prepaid expenses of US$7.3 million and US$7.2 million, respectively, based on the management’ estimation of the recoverability.

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