Financing Receivables - Short-Term Payment Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term payment plans, net	$ 6,488	$ 10,821
Short-term payment plans, gross
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term payment plans, gross	121	1,973
Less: allowance for losses	(6)	(99)
Short-term payment plans, net	$ 115	$ 1,874