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Leases (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]      
Operating Lease, Weighted Average Remaining Lease Term 3 years 1 month 6 days 3 years 7 months 6 days  
Operating Lease, Weighted Average Discount Rate, Percent 11.30% 10.10%  
Operating Lease, Right-of-Use Asset $ 2.7 $ 7.9  
Operating Lease, Liability, Current 1.4 3.3  
Operating Lease, Liability, Noncurrent 2.6 6.1  
Operating Lease, Liability 4.0 9.4  
Operating Lease, Expense (0.1) (0.7) $ (0.5)
Operating Lease, Expense Adjustment (1.5) (1.6) (2.0)
Operating Lease, Payments $ (1.7) (1.6) $ (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  
Increase (Decrease) in Operating Lease Liability $ 6.6