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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 48,404,432 |
Capital loss carryforward | 147,552 |
Accrued expenses | 559,096 |
Reserve for Dorado accounts receivable | 287,335 |
Start-up costs | 7,042 |
Excess of book over tax depreciation | 707,044 |
Stock option and restricted stock award expense | 1,331,067 |
Investment in unconsolidated entities | 1,387,970 |
Less: valuation allowance | (52,684,059) | $ (49,235,133)
Deferred tax assets | 147,479 |
Deferred tax liability: |  |
Property and equipment basis | 43,155 |
Prepaid expenses | 104,324 |
Deferred tax liabilities | 147,479 |
Net deferred tax asset | $ 0 |

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