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Income Taxes (Expense For Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current:    
Federal $ 11 $ 0
State 110 41
Foreign 361 0
Total current expense 482 41
Deferred Federal, State and Local, Tax Expense (Benefit) [Abstract]    
Federal (8,245) (2,125)
State (832) 5
Foreign (738) 9
Change in valuation allowance 9,288 2,132
Total deferred expense (527) 21
Income Tax Expense (Benefit), Total $ (45) $ 62