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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss and tax credit carryforwards | $ 72,201,754 | $ 66,867,637 |
Capital loss carryforward | 5,514 | 5,683 |
Accrued expenses | 363,149 | 253,374 |
Start-up costs | 5,664 | 5,837 |
Excess of book over tax depreciation | 259,667 | 394,649 |
Stock option and restricted stock award expense | 1,429,488 | 1,464,210 |
Debt Extinguishment | 58,161 | 59,934 |
Less: valuation allowance | (74,138,667) | (68,859,984) | $ (68,859,984)
Deferred tax assets | 184,730 | 191,340 |
Deferred tax liability: |  |  |
Property and equipment basis | 10,434 | 48,545 |
Prepaid expenses | 174,296 | 142,795 |
Deferred tax liabilities | 184,730 | 191,340 |
Net deferred tax asset | $ 0 | $ 0 |

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