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Schedule of Tax Benefit and Effective Income Tax (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Liquidated Damages |  |  |  |  |  |
Federal benefit expected at statutory rate |  |  |  |  | $ (18,694,437) | $ (12,188,924)
Federal benefit expected at statutory rate, percentage |  |  |  |  | 21.00% | 21.00%
State and local taxes, net of federal benefit |  |  |  |  | $ (5,279,879) | $ (3,053,709)
State and local taxes, net of federal benefit, percentage |  |  |  |  | 5.90% | 5.30%
Stock-based compensation |  |  |  |  | $ 1,768,735 | $ 1,591,202
Stock based compensation, percentage |  |  |  |  | (2.00%) | (2.70%)
Unearned revenue |  |  |  |  | $ (5,120,330) | $ (1,969,056)
Unearned revenue, percentage |  |  |  |  | 5.80% | 3.40%
Interest expense |  |  |  |  | $ 1,173,535 | $ 1,015,199
Interest expense, percentage |  |  |  |  | (1.30%) | (1.70%)
Other differences, net |  |  |  |  | $ 152,294 | $ 199,643
Other differences, net, percentage |  |  |  |  | (0.20%) | (0.40%)
Valuation allowance |  |  |  |  | $ 26,168,671 | $ (6,685,348)
Valuation allowance, percentage |  |  |  |  | (29.40%) | 11.50%
Other permanent differences |  |  |  |  | $ 42,243 | $ 1,549,866
Other permanent differences, percentage |  |  |  |  | 0.00% | (2.70%)
Tax provision (benefit) and effective income tax rate | $ (229,699) |  | $ (229,699) |  | $ 210,832 | $ (19,541,127)
Tax provision (benefit) and effective income tax rate, percentage |  |  | 0.29% | 0.00% | (0.20%) | 33.70%

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