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Income Taxes - Loss from Operations Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Pre-tax book income - United States $ (19,013) $ (19,352)
Pre-tax book income $ (19,013) $ (19,352)