CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥) shares	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 CNY (¥) shares	Dec. 31, 2024 $ / shares
Short-term investments, available-for-sale debt securities current	¥ 2,212,717		¥ 985,642
Long-term investments, available-for-sale debt securities noncurrent	337,494		863,625
Accrued expenses and other current liabilities	1,537,477	$ 219,856	1,245,207
Deferred revenue, current portion	2,289,322	327,369	1,867,096
Operating lease liabilities, current portion	136,709	19,549	147,635
Income tax payable	222	32	665
Operating lease liabilities, non-current portion	316,703	45,288	344,609
Deferred tax liabilities	75,248	$ 10,760	70,604
Variable interest entity, primary beneficiary [Member]
Accrued expenses and other current liabilities	1,131,781		811,879
Deferred revenue, current portion	2,288,255		1,867,096
Operating lease liabilities, current portion	129,258		114,471
Income tax payable	171		606
Operating lease liabilities, non-current portion	309,940		337,258
Deferred tax liabilities	¥ 75,248		¥ 70,316
Common Class A [Member]
Ordinary shares, par value \| $ / shares		$ 0.0001		$ 0.0001
Ordinary shares, shares authorized \| shares	800,000,000	800,000,000	800,000,000
Ordinary shares, shares issued \| shares	101,974,316	101,974,316	101,974,316
Ordinary shares, shares outstanding \| shares	86,673,876	86,673,876	95,317,937
Common Class B [Member]
Ordinary shares, par value \| $ / shares		$ 0.0001		$ 0.0001
Ordinary shares, shares authorized \| shares	100,000,000	100,000,000	100,000,000
Ordinary shares, shares issued \| shares	73,305,288	73,305,288	73,305,288
Ordinary shares, shares outstanding \| shares	73,305,288	73,305,288	73,305,288

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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