Description of Business and Summary of Significant Accounting Policies - Property and Equipment, Net (Details)	12 Months Ended
	Dec. 31, 2021
Electronic equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	1 year
Electronic equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	4 years
Vehicles | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	5 years
Vehicles | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	6 years
Office and other equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	4 years
Office and other equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	6 years