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CONVERTIBLE REDEEMABLE PREFERRED SHARES - Narratives (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2021 CNY (¥) | Apr. 30, 2025
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |
Preferred stock, redemption simple interest (%) |  |  |  |  | 12.00% |
Preferred stock, initial conversion ratio |  |  |  | 1 |  | 1
Payments for offering expenses | ¥ 36,272 | $ 5,186 | ¥ 10,091 |  |  |
Series A preferred stock |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |
Preferred stock, dividend rate (%) |  |  |  |  | 8.00% |
Payments for offering expenses |  |  |  |  | ¥ 300 |
Series B preferred stock |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |
Preferred stock, dividend rate (%) |  |  |  |  | 8.00% |
Payments for offering expenses |  |  |  |  | ¥ 3,100 |
Series B+ Preferred Shares |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |
Preferred stock, dividend rate (%) | 8.00% | 8.00% |  |  |  |
Payments for offering expenses |  |  |  | ¥ 0 |  |

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