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Income Taxes - Components of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current expense (benefit):      
Federal $ 0 $ 0 $ 0
State 181 0 0
Foreign 59 68 80
Total current tax expense (benefit) 240 68 80
Deferred expense (benefit):      
Federal 0 0 0
State 0 0 0
Foreign (11) (3) (36)
Total deferred tax expense (benefit) (11) (3) (36)
Total Tax Expense (benefit) $ 229 $ 65 $ 44