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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2018
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Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 66,867,637 |
Capital loss carryforward | 5,683 |
Accrued expenses | 253,374 |
Start-up costs | 5,837 |
Excess of book over tax depreciation | 394,649 |
Stock option and restricted stock award expense | 1,464,210 |
Debt Extinguishment | 59,934 |
Less: valuation allowance | (68,859,984) | $ (56,819,522)
Deferred tax assets | 191,340 |
Deferred tax liability: |  |
Property and equipment basis | 48,545 |
Prepaid expenses | 142,795 |
Deferred tax liabilities | 191,340 |
Net deferred tax asset | $ 0 |

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