Nature of Business and Significant Accounting Policies - Barter, Advertising and Marketing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Barter transactions:
Barter revenue	$ 449	$ 434
Barter expense	(490)	(419)
Barter revenue and expense	(41)	15
Advertising and marketing costs:
Advertising and marketing costs	$ 39,300	$ 3,100