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CONVERTIBLE NOTES - Summary of Changes In Convertible Notes, Net of Unamortized Discount (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2025 USD ($)
CONVERTIBLE NOTES |  |  |
Balance at January 1, | ¥ 43,061 |  |
Issuance of convertible notes, face value | 86,247 |  |
Debt discount from issuance/sale of ADS shares | (43,796) |  |
Conversion of convertible notes into ordinary shares | (52,418) |  |
Amortization of debt discount | 15,347 |  |
Exchange rate change on convertible notes' face value | (289) |  |
Convertible notes | 48,152 | ¥ 43,061 | $ 6,886
Convertible notes, net at December 31, | ¥ 48,152 | ¥ 43,061 |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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