Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 26	$ 17
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			$ 324,800
Tax credit carryforwards			8,900
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			6,500
Tax credit carryforwards			$ 1,600