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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Current state income tax expense $ 45 $ 38
Current foreign income tax expense 211 78
Deferred federal income tax expense 0 0
Total income tax expense $ 256 $ 116