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Consolidated Statement of Cash Flows - Additional information (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income tax payments $ 0 $ 0  
Total interest payments 4,625,000 6,128,000  
Finance Lease, Asset 2,820,000   $ 2,956,000
Finance Lease, Liability $ 3,005,000   $ 3,109,000
Office equipment leased      
Finance Lease, Asset   63,000  
Finance Lease, Liability   $ 63,000