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Income Taxes - Components of Federal, State and Foreign Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Foreign $ (88) $ 84  
Total current tax (benefit) expense (88) 84  
Deferred:      
Foreign 1,393 (775) $ (799)
Total deferred tax expense (benefit) 1,393 (775) (799)
Total income tax expense (benefit) $ 1,305 $ (691) $ (799)