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Leases (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Operating Lease, Weighted Average Remaining Lease Term 5 years 3 months 18 days  
Operating Lease, Weighted Average Discount Rate, Percent 12.50%  
Operating Lease, Right-of-Use Asset $ 2.1  
Operating Lease, Liability, Current 0.9 $ 2.4
Operating Lease, Liability, Noncurrent 3.0  
Operating Lease, Liability 3.9  
Operating Lease, Expense 0.5 2.6
Operating Lease, Expense Adjustment (2.0) $ (0.3)
Operating Lease, Payments 2.4  
Operating Lease, Liability, Decrease $ 1.0  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other long-term assets Other long-term assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts payable and accrued liabilities Accounts payable and accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities