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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed balance sheets (Parenthetical) (Details) - $ / shares | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Treasury stock, common shares | 12,101,847 | 12,101,847
Class A ordinary shares |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Ordinary shares, par value per share | $ 0.0001 | $ 0.0001
Ordinary shares, shares authorized | 500,000,000 | 500,000,000
Ordinary shares, shares issued | 96,565,584 | 96,565,584
Ordinary shares, shares outstanding | 84,463,737 | 84,463,737
Class B ordinary shares |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Ordinary shares, par value per share | $ 0.0001 | $ 0.0001
Ordinary shares, shares authorized | 45,787,948 | 45,787,948
Ordinary shares, shares issued | 45,787,948 | 45,787,948
Ordinary shares, shares outstanding | 45,787,948 | 45,787,948
Parent Company |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Treasury stock, common shares | 12,101,847 | 12,101,847
Parent Company | Class A ordinary shares |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Ordinary shares, par value per share | $ 0.0001 | $ 0.0001
Ordinary shares, shares authorized | 500,000,000 |
Ordinary shares, shares issued | 96,565,584 | 96,565,584
Ordinary shares, shares outstanding | 84,463,737 | 84,463,737
Parent Company | Class B ordinary shares |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |
Ordinary shares, par value per share | $ 0.0001 | $ 0.0001
Ordinary shares, shares authorized | 45,787,948 | 45,787,948
Ordinary shares, shares issued | 45,787,948 | 45,787,948
Ordinary shares, shares outstanding | 45,787,948 | 45,787,948

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