Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Computers
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Motor vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years