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Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Taxes    
Income tax expense (Benefit) $ (139,000) $ 3,000
U.S. statutory rate   21.00%
Estimated aggregate alternative minimum tax refund receivable 736,000  
Alternative minimum tax refund receivable recorded $ 146,000