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Treasury Shares - Additional Information (Detail) | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 CNY (¥) shares | Aug. 19, 2021 USD ($) | Mar. 15, 2021 USD ($) $ / shares shares | Mar. 15, 2021 CNY (¥) shares | Mar. 02, 2021 USD ($) | May 29, 2020 USD ($) $ / shares shares | May 29, 2020 CNY (¥) shares | Jul. 19, 2019 USD ($) $ / shares shares | Jul. 19, 2019 CNY (¥) shares
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Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Value |  |  |  | $ 39,952,104 | ¥ 259,672,572 |  |  |  |  |
Share Repurchase Program 2019 and Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Value | $ 78,293,998 | ¥ 514,259,371 |  |  |  |  |  |  |  |
American Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Average repurchase price per ADS | $ / shares | $ 6.35 |  |  |  |  |  |  |  |  |
American Depositary Shares [Member] | Share Repurchase Programs 2019 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized to repurchase of shares | $ | $ 10,000,000 |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  |  |  |  |  |  | 431,556 | 431,556
Average repurchase price per ADS | $ / shares |  |  |  |  |  |  |  |  | $ 6.95 |
Repurchase Value |  |  |  |  |  |  |  |  | $ 2,999,314 | ¥ 20,638,881
American Depositary Shares [Member] | Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  | 7,500,928 | 7,500,928 |  |  |  |  |
Average repurchase price per ADS | $ / shares |  |  |  | $ 5.33 |  |  |  |  |  |
Repurchase Value | $ |  |  |  |  |  | $ 100,000,000 |  |  |  |
American Depositary Shares [Member] | Share Repurchase Program 2019 and Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased | 12,331,000 | 12,331,000 |  |  |  |  |  |  |  |
Average repurchase price per ADS | $ / shares | $ 6.35 |  |  |  |  |  |  |  |  |
American Depositary Shares [Member] | Minghuai LP And Xiehuai LP [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Value | $ 74,111,604 | ¥ 485,263,213 |  |  |  |  |  |  |  |
American Depositary Shares [Member] | Minghuai LP And Xiehuai LP [Member] | Share Repurchase Programs 2019 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  |  |  |  | 1,398,516 | 1,398,516 |  |
Average repurchase price per ADS | $ / shares |  |  |  |  |  |  | $ 5.00 |  |  |
Repurchase Value |  |  |  |  |  |  | $ 6,992,580 | ¥ 49,219,318 |  |
American Depositary Shares [Member] | Minghuai LP And Xiehuai LP [Member] | Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  | 3,000,000 | 3,000,000 |  |  |  |  |
Average repurchase price per ADS | $ / shares |  |  |  | $ 9.45 |  |  |  |  |  |
Repurchase Value |  |  |  | $ 28,350,000 | ¥ 184,728,600 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased | 23,324,758 | 23,324,758 |  |  |  |  |  |  |  |
Common Class A [Member] | Share Repurchase Programs 2019 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  |  |  |  |  |  | 863,112 | 863,112
Common Class A [Member] | Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  | 15,001,856 | 15,001,856 |  |  |  |  |
Repurchase Value | $ |  |  | $ 100,000,000 |  |  |  |  |  |  |
Common Class A [Member] | Share Repurchase Program 2019 and Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased | 24,662,000 | 24,662,000 |  |  |  |  |  |  |  |
Common Class A [Member] | Minghuai LP And Xiehuai LP [Member] | Share Repurchase Programs 2019 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  |  |  |  | 2,797,032 | 2,797,032 |  |
Common Class A [Member] | Minghuai LP And Xiehuai LP [Member] | Share Repurchase Programs 2021 [Member] |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares repurchased |  |  |  | 6,000,000 | 6,000,000 |  |  |  |  |

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