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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Current state income tax expense $ 38 $ 0
Current foreign income tax expense 78 0
Deferred federal income tax expense 0 0
Total income tax expense $ 116 $ 0