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Subsequent Events - Additional Information (Detail) |  |  |  | 4 Months Ended |  |  |  |
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition Number of shares purchased for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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