INVESTMENTS AND AVAILABLE-FOR-SALE SECURITIES - Schedule of Long-term Investments (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
-Debt investment
Available-for-sale securities	¥ 238,464	$ 34,100	¥ 150,922
Held-to-maturity debt securities recorded as long-term investments	117,282		74,400
-Equity investments recorded as long-term investments
Investments accounted for under the equity method.	698,437		899,362
Equity securities with readily determinable fair values	347,169		542,024
Equity securities without readily determinable fair values	216,795		257,095
Equity securities applying fair value option	62,000		97,372
Subtotal	1,324,401		1,795,853
Total long-term investments	¥ 1,441,683	$ 206,158	¥ 1,870,253

Amount of investment in equity security with readily determinable fair value.

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The total amount of equity investments that are intended to be held for an extended period of time (longer than one operating cycle).

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The total amount of investments excluding debt security, available for sale that are intended to be held for an extended period of time (longer than one operating cycle).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

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Amount of investment in equity security without readily determinable fair value.

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