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ACCOUNTS RECEIVABLE, NET (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥)
--- | --- | --- | ---
Nonrelated party |  |  |
ACCOUNTS RECEIVABLE, NET |  |  |
Accounts receivable, gross | ¥ 4,287 | $ 612 | ¥ 505
Allowance for credit losses for accounts receivable | (505) | (72) | ¥ (505)
Accounts receivable, net | 3,782 | 540 |
Related party |  |  |
ACCOUNTS RECEIVABLE, NET |  |  |
Allowance for credit losses for accounts receivable | 0 |  |
Accounts receivable, net | ¥ 6,284 | $ 899 |

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