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Income Taxes - Loss from Operations Before Provision for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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