Summary of Significant Accounting Policies - Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Credit Losses
Charged to operating expenses	$ 1,268	$ 899	$ 3,242
Continuing Operations
Allowance for Credit Losses
Beginning balance	6,334	7,513	4,991
Charged to operating expenses	1,268	899	3,384
Write offs of accounts receivable, net of recoveries	(1,805)	(2,078)	(862)
Ending balance	$ 5,797	$ 6,334	$ 7,513