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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
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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