Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets, valuation allowance	$ 94,751,000	$ 67,073,000
Tax credits, expiration date	Dec. 31, 2033
Interest or penalties	$ 0
Domestic Tax Authority [Member]
Operating loss carryforwards without expiration	168,100,000
Operating Loss Carryforwards	191,700,000
Income tax credits	8,300,000
State and Local Jurisdiction [Member]
Operating loss carryforwards without expiration	94,000
Operating Loss Carryforwards	410,000,000.0
Income tax credits	$ 1,800,000