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Taxation - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC |  | 25.00% | 25.00% | 25.00% | 25.00%
Withholding income tax percentage |  |  |  |  | 10.00%
Percentage of share holding in FIE |  |  |  |  | 25.00%
Withholding tax amount |  | ¥ 0 |  | ¥ 0 |
Income Tax Expense (Benefit) |  | ¥ 376 | $ 59 | 999 | ¥ 0
HONG KONG [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC | 16.50% |  |  |  |
HONG KONG [Member] | Inland Revenue, Hong Kong [Member] | Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Withholding income tax percentage |  |  |  |  | 5.00%
CHINA [Member] | State Administration of Taxation, China [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC |  |  |  |  | 25.00%
Preferential tax rate |  |  |  |  | 15.00%
SINGAPORE |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC |  | 17.00% | 17.00% |  |
Withholding income tax percentage |  | 0.00% | 0.00% |  |
Income Tax Expense (Benefit) |  | ¥ 300 |  | ¥ 1,000 |
Assessable profits on the first HK$2 million [Member] | HONG KONG [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC | 8.25% |  |  |  |
Assessable profits in excess of HK$2 million [Member] | HONG KONG [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate of the PRC | 16.50% |  |  |  |

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