Description of Business and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Deferred tax assets	$ 6,907
Deferred tax liabilities		$ 4,438
U.K. and Australia
Tax Credit Carryforward [Line Items]
Deferred tax assets	$ 6,900	6,900
Deferred tax liabilities		$ 4,400