Revenue Information and Deferred Sales Commissions Revenue Information and Deferred Sales Commissions - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue Information
Revenues	$ 158,706	$ 161,524	$ 231,698
Contract with Customer, Asset, Reclassified to Receivable	900	900
Dealer revenue
Revenue Information
Revenues	143,239	156,485	222,000
OEM incentives revenue
Revenue Information
Revenues	14,958	4,390	8,676
Other revenue
Revenue Information
Revenues	$ 509	$ 649	$ 1,022