Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Software development
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Software development | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Program development
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Program development | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years