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Income Taxes - Reconciliation of tax expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Statutory U.S. federal rate $ (6,649,878) $ (3,878,443)
State income tax net of federal benefit (1,141,758) (767,428)
Permanent items 77,747 109,580
Other prior year adjustments (99,275) (1,339)
Rate adjustment (12,921) 65,267
Valuation allowance $ 7,826,085 $ 4,472,363