Statutory Reserves and Restricted Net Assets - Statement of Financial Position (Parenthetical) (Detail) - $ / shares	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 20, 2017
Mezzanine equity, shares outstanding	0	109,481,969	109,481,969
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001		$ 0.0001
Ordinary shares, authorized	0	390,518,031		500,000,000
Ordinary shares, issued	0	48,253,425
Ordinary shares, outstanding	0	48,253,425
Parent Company [Member]
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	0	390,518,031
Ordinary shares, issued	0	48,253,425
Ordinary shares, outstanding	0	48,253,425
Series A Redeemable Convertible Preferred Stock [Member] \| Parent Company [Member]
Mezzanine equity, par value (in dollars per share)	$ 0.0001	$ 0.0001
Mezzanine equity, shares authorized	0	15,040,570
Mezzanine equity, shares issued	0	15,040,570
Mezzanine equity, shares outstanding	0	15,040,570
Series B Redeemable Convertible Preferred Stock [Member] \| Parent Company [Member]
Mezzanine equity, par value (in dollars per share)	$ 0.0001	$ 0.0001
Mezzanine equity, shares authorized	0	7,085,330
Mezzanine equity, shares issued	0	7,085,330
Mezzanine equity, shares outstanding	0	7,085,330
Series C Redeemable Convertible Preferred Stock [Member] \| Parent Company [Member]
Mezzanine equity, par value (in dollars per share)	$ 0.0001	$ 0.0001
Mezzanine equity, shares authorized	0	23,786,590
Mezzanine equity, shares issued	0	23,786,590
Mezzanine equity, shares outstanding	0	23,786,590
Series D Redeemable Convertible Preferred Stock [Member] \| Parent Company [Member]
Mezzanine equity, par value (in dollars per share)	$ 0.0001	$ 0.0001
Mezzanine equity, shares authorized	0	37,152,161
Mezzanine equity, shares issued	0	37,152,161
Mezzanine equity, shares outstanding	0	37,152,161
Series E Redeemable Convertible Preferred Stock [Member] \| Parent Company [Member]
Mezzanine equity, par value (in dollars per share)	$ 0.0001	$ 0.0001
Mezzanine equity, shares authorized	0	26,417,318
Mezzanine equity, shares issued	0	26,417,318
Mezzanine equity, shares outstanding	0	26,417,318
Common Class A [Member]
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	483,068,176	0
Ordinary shares, issued	163,294,773	0
Ordinary shares, outstanding	163,294,773	0
Common Class A [Member] \| Parent Company [Member]
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	483,068,176	0
Ordinary shares, issued	163,294,773	0
Ordinary shares, outstanding	163,294,773	0
Common Class B [Member]
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	16,931,824	0
Ordinary shares, issued	16,931,824	0
Ordinary shares, outstanding	16,931,824	0
Common Class B [Member] \| Parent Company [Member]
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	16,931,824	0
Ordinary shares, issued	16,931,824	0
Ordinary shares, outstanding	16,931,824	0

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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