Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Depreciation	$ 2.0	$ 1.9	$ 1.9
Minimum [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	1 year
Minimum [Member] | Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	3 years
Maximum [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	10 years
Maximum [Member] | Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	5 years