Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
State	$ 3	$ 3	$ 3
Total current	3	3	3
Total provision for income taxes	$ 3	$ 3	$ 3