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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 52,876,144 | $ 48,404,432
Capital loss carryforward | 5,052 | 147,552
Accrued expenses | 614,467 | 559,096
Reserve for Dorado accounts receivable | 156,538 | 287,335
Start-up costs | 2,595 | 7,042
Excess of book over tax depreciation | 604,287 | 707,044
Stock option and restricted stock award expense | 1,343,100 | 1,331,067
Investment in unconsolidated entity | 1,387,970 | 1,387,970
Less: valuation allowance | (56,819,522) | (52,684,059)
Deferred tax assets | 170,631 | 147,479
Deferred tax liability: |  |
Property and equipment basis | 43,155 | 43,155
Prepaid expenses | 127,476 | 104,324
Deferred tax liabilities | 170,631 | 147,479
Net deferred tax asset | $ 0 | $ 0

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