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Taxation - Additional Information (Detail) - CNY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IncomeTaxDisclosure [Line Items] |  |  |
Value added tax rate | 6.00% |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00%
Accumulated tax losses | ¥ 308.9 |  |
Qualified High and New Technology Enterprise [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Tax losses carryforward expiration period | 10 years |  |
Qualified High and New Technology Enterprise [Member] | Expire in Two Thousand And Twenty Two [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Preferential income tax rate | 15.00% |  |
April 1, 2019 to December 31, 2021 [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Percentage of value added tax rate in super deduction | 10.00% |  |
United States [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Statutory income tax rate | 21.00% | 21.00% | 21.00%
United States [Member] | California corporate franchise tax [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Statutory income tax rate | 8.84% | 8.84% | 8.84%
Tax losses carryforward expiration period | 20 years |  |
China [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Tax losses carryforward expiration period | 5 years |  |
Percentage of tax deduction on qualified research and development expenses | 175.00% |  |
Percentage of additional deduction on qualified research and development expenses | 75.00% |  |
China [Member] | Qualified High and New Technology Enterprise [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Preferential income tax rate | 15.00% |  |
China [Member] | New Enterprise Income Tax Law [Member] |  |  |
IncomeTaxDisclosure [Line Items] |  |  |
Uniform tax rate for foreign investment enterprises and domestic | 25.00% |  |
Effective date of new enterprise income tax law | Jan. 01, 2008 |  |

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