Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 261	$ 764	$ 188
Additions Charged to Costs and Expenses	349	336	967
Deductions	(86)	(839)	(391)
Balance at End of Year	$ 524	$ 261	$ 764