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Subsequent Events - Additional Information (Detail)					4 Months Ended
	Apr. 22, 2022 USD ($) $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares	Jan. 31, 2022 CNY (¥) shares	Dec. 31, 2021 $ / shares shares	Apr. 21, 2022 USD ($) shares	May 01, 2021 $ / shares	Oct. 15, 2020 $ / shares	Feb. 15, 2019 $ / shares	May 25, 2018 $ / shares
Subsequent Event [Line Items]
Exercise price						$ 1.2951	$ 1.7951	$ 1.7951	$ 1.7951
Subsequent Event [Member]
Subsequent Event [Line Items]
Special dividend (dollars per share)	$ 0.5
American Depositary Shares [Member]
Subsequent Event [Line Items]
Average repurchase price per ADS				$ 6.35
American Depositary Shares [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Special dividend (dollars per share)	$ 1
Repurchase Value		$ 70,620,565	¥ 449,170,972
Number of Shares repurchased | shares		2,271,774	2,271,774
Average repurchase price per ADS		$ 31.09
American Depositary Shares [Member] | Subsequent Event [Member] | Share Repurchase Program 2021 [Member]
Subsequent Event [Line Items]
Repurchase Value | $					$ 4,000,000
Number of Shares repurchased | shares					1,503,645
American Depositary Shares [Member] | Subsequent Event [Member] | New Share Repurchase Program [Member]
Subsequent Event [Line Items]
Repurchase Value | $	$ 50,000,000
Common Class A [Member]
Subsequent Event [Line Items]
Number of Shares repurchased | shares				23,324,758
Common Class A [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Exercise price	$ 1.2951
Common Class A [Member] | Subsequent Event [Member] | Mr Xiaojun Zhang [Member]
Subsequent Event [Line Items]
Share based compensation arrangement by share based payment award, Shares purchased for award | shares	6,000,000
Common Class A [Member] | Subsequent Event [Member] | Mr Jiayuan Lin [Member]
Subsequent Event [Line Items]
Share based compensation arrangement by share based payment award, Shares purchased for award | shares	6,000,000

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- Definition

The distribution amount per share for all classes of units.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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