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INVESTMENTS IN CONSOLIDATED SUBSIDIARIES - Shenzhen Shuzhi (Details) ¥ in Thousands, $ in Thousands |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Sep. 23, 2025 shares | Jul. 22, 2025 CNY (¥) shares | Jul. 21, 2025 CNY (¥) shares | Mar. 26, 2025 CNY (¥) shares | Nov. 13, 2023 shares | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 18, 2024 item | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($)
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of noncontrolling interest |  |  |  |  |  | ¥ (21,043) | $ (3,009) | ¥ (13,777) | $ (1,971) |  | ¥ (24,936) | $ (3,567) | ¥ (17,771) | $ (2,541)
Issuance of ordinary shares |  |  |  |  |  | 69,704 |  |  |  |  |  |  |  |
Shenzhen Shuzhi Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value of shares issued |  |  | ¥ 9,800 |  |  |  |  |  |  |  |  |  |  |
Amount recognized |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Share based compensation expense |  |  | ¥ 3,500 |  |  |  |  |  |  |  |  |  |  |
Number of shares released | shares |  |  | 9,946,200 |  |  |  |  |  |  |  |  |  |  |
Percentage of grant date fair value |  |  | 35.38% |  |  |  |  |  |  |  |  |  |  |
Number of shares canceled | shares |  |  | 18,163,800 |  |  |  |  |  |  |  |  |  |  |
Fair value of share canceled |  |  | ¥ 6,300 |  |  |  |  |  |  |  |  |  |  |
Payment to noncontrolling interest |  | ¥ 14,560 |  |  |  |  |  |  |  |  |  |  |  |
Excess over carrying value of noncontrolling interest |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Threshold net profit after tax |  | ¥ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum period for achievement of milestone |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | ¥ 0 |  |  |  |  |  |  |  |  |  |  |  |
Shenzhen Shuzhi Technology Co Ltd | First operational year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares released | shares |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Share value of contingent consideration |  | ¥ 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash installment of contingent consideration |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Threshold net profit after tax |  | ¥ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Shenzhen Shuzhi Technology Co Ltd | Second operational year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares released | shares |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Share value of contingent consideration |  | ¥ 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash installment of contingent consideration |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Threshold net profit after tax |  | ¥ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Class A ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares (in shares) | shares | 65,934,000 |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |
Class A ordinary shares | Shenzhen Shuzhi Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  | 28,110,000 |  |  |  |  |  |  |  |  |  |
Grant date fair value of shares issued |  |  |  | ¥ 9,800 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 36,800 |  |  |  |  |  |  |  |  |  |
Amount recognized |  |  |  | ¥ 0 |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares (in shares) | shares |  | 66,356,400 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares |  |  |  |  |  | ¥ 15,000 |  |  |  |  |  |  |  |
Shenzhen Shuzhi Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of board members | item |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Shenzhen Shuzhi Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments in Consolidated Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest owned |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |
Percentage of shares owned |  | 49.00% | 49.00% |  |  |  |  |  |  | 49.00% |  |  |  |
Number of board members appointed by parent | item |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Carrying value of noncontrolling interest |  | ¥ 440 |  |  |  |  |  |  |  |  |  |  |  |

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