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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Deferred tax liabilities, undistributed foreign earnings $ 0  
Undistributed earnings of foreign subsidiaries 435  
Unrecognized tax benefits that would impact effective tax rate 0 $ 0
Unrecognized tax benefits, income tax penalties and interest expense 0 $ 0
State and Local Jurisdiction [Member]    
Operating loss carryforwards 219,007  
U.S. Federal [Member]    
Operating loss carryforwards 216,196  
Tax credit carryforwards 2,016  
Deferred tax assets, interest carryforwards 47,335  
China [Member]    
Operating loss carryforwards $ 315