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Significant Accounting Policies - Summary of Property Plant Equipment Estimated Useful Lives (Detail)
12 Months Ended
Dec. 31, 2021
Electronic Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 3 years
Furniture And Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 5 years
Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 4 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful lives shorter of expected lives of leasehold improvement and lease term