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CONVERTIBLE REDEEMABLE PREFERRED SHARES - Issuances Summary (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 05, 2023 | Jul. 20, 2023 | May 14, 2021 | Feb. 22, 2021 | Dec. 25, 2020 | Jul. 31, 2023 | Dec. 31, 2023
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |  |
Fair value change of forward contract related to Series B+ preferred shares |  |  |  |  |  |  | ¥ (105,483)
Series A preferred stock |  |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |  |
Issue Price per share |  |  |  | ¥ 4.7 | ¥ 4.7 |  |
Shares issued |  |  |  | 1,055,546 | 33,777,482 |  |
Aggregate issuance price |  |  |  | ¥ 5,000 | ¥ 160,000 |  |
Series B preferred stock |  |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |  |
Issue Price per share |  |  | ¥ 11.4 |  |  |  |
Shares issued |  |  | 12,256,755 |  |  |  | 2,657,649
Aggregate issuance price |  |  | ¥ 140,000 |  |  |  | ¥ 39,172
Series B+ Preferred Shares |  |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |  |
Issue Price per share |  | ¥ 16.2 |  |  |  |  |
Shares issued |  | 12,780,417 |  |  |  |  | 20,374,577
Aggregate issuance price |  | ¥ 209,902 |  |  |  |  | ¥ 436,905
Fair value change of forward contract related to Series B+ preferred shares |  |  |  |  |  |  | ¥ 105,000
Series B+ Preferred Shares | One Series B+ Preferred shareholder |  |  |  |  |  |  |
CONVERTIBLE REDEEMABLE PREFERRED SHARES |  |  |  |  |  |  |
Issue Price per share | ¥ 16.2 |  |  |  |  |  |
Shares issued | 7,594,160 |  |  |  |  |  |
Aggregate issuance price | ¥ 123,000 |  |  |  |  |  |
Number of convertible redeemable preferred shares agreed to purchase |  |  |  |  |  | 7,594,160 |
Cash consideration from issue of convertible redeemable preferred shares |  |  |  |  |  | ¥ 123,000 |

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