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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Deferred tax liabilities $ 616,000 $ 215,000  
Uncertain tax positions 0 0  
Uncertain tax positions, income tax penalties and interest expense $ 0 $ 0 $ 0