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Share-Based Compensation - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 11, 2021 CNY (¥) | Mar. 11, 2021 USD ($) $ / shares | Oct. 31, 2020 shares | May 31, 2021 shares | May 31, 2018 shares | Feb. 28, 2018 shares | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | May 01, 2021 $ / shares | Mar. 22, 2021 $ / shares | Oct. 15, 2020 $ / shares | Feb. 15, 2019 $ / shares | May 25, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted | shares |  |  | 8,353,658 | 8,454,422 |  | 5,569,105 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price for options |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.2951 |  | $ 1.7951 | $ 1.7951 | $ 1.7951
Total fair value of the vested share options |  |  |  |  |  |  | ¥ 87,634,835 | $ 13,751,819 | ¥ 78,754,828 |  | ¥ 82,265,991 |  |  |  |  |  |  |
Cash dividend per share |  | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cash dividend | ¥ 955,400,000 | $ 147,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised during the years | $ |  |  |  |  |  |  |  | 5,400,000 |  | $ 3,500,000 |  | $ 0 |  |  |  |  |  |
Proceeds from exercise of share options |  |  |  |  |  |  | 8,236,613 | 1,292,504 | 6,693,716 |  |  |  |  |  |  |  |  |
ESOP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of share options |  |  |  |  |  |  | ¥ 8,236,613 | $ 1,292,504 | ¥ 6,693,715 |  | ¥ 0 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of unexercised option |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.7951 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of unexercised option |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.2951 |  |  |
Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted | shares |  |  |  |  | 5,569,105 |  |  |  |  |  |  |  |  |  |  |  |  |
Options under the ESOP | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,845,526
Exercise price for options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.7951
Vesting period of options granted |  |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |  |  |  |
Vesting term |  |  |  |  |  |  | Options under the Company’s plan vest over a total period of 4 years from the grant date, pursuant which 50% of the options will vest upon the second anniversary of the grant date and 25% of the options will vest upon the third anniversary and fourth anniversary of the grant date, respectively. | Options under the Company’s plan vest over a total period of 4 years from the grant date, pursuant which 50% of the options will vest upon the second anniversary of the grant date and 25% of the options will vest upon the third anniversary and fourth anniversary of the grant date, respectively. |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  | ¥ 3,184,010 |  |  |  |  |  | $ 499,641 |  |  |  |  |
Expense is expected to recognized over weighted-average period |  |  |  |  |  |  | 4 months 24 days | 4 months 24 days |  |  |  |  |  |  |  |  |  |
Expense is expected to recognized over weighted-average remaining contractual period |  |  |  |  |  |  | 6 years 4 months 24 days | 6 years 4 months 24 days |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche One [Member] | Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  | ¥ 6,520,703 |  |  |  |  |  | 1,023,241 |  |  |  |  |
Expense is expected to recognized over weighted-average period |  |  |  |  |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |
Expense is expected to recognized over weighted-average remaining contractual period |  |  |  |  |  |  | 7 years 1 month 17 days | 7 years 1 month 17 days |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two [Member] | Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  | ¥ 37,324,385 |  |  |  |  |  | 5,857,010 |  |  |  |  |
Expense is expected to recognized over weighted-average period |  |  |  |  |  |  | 1 year 9 months | 1 year 9 months |  |  |  |  |  |  |  |  |  |
Expense is expected to recognized over weighted-average remaining contractual period |  |  |  |  |  |  | 8 years 9 months 14 days | 8 years 9 months 14 days |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Three [Member] | Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |
Share Based Compensation Award Tranche Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested options |  |  |  |  |  |  | ¥ 79,987,684 |  |  |  |  |  | $ 12,551,813 |  |  |  |  |
Expense is expected to recognized over weighted-average period |  |  |  |  |  |  | 2 years 1 month 28 days | 2 years 1 month 28 days |  |  |  |  |  |  |  |  |  |
Expense is expected to recognized over weighted-average remaining contractual period |  |  |  |  |  |  | 9 years 4 months 2 days | 9 years 4 months 2 days |  |  |  |  |  |  |  |  |  |

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