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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2015
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 44,772,169  
Capital loss carryforward 147,552  
Accrued expenses 285,295  
Reserve for Dorado accounts receivable 156,538  
Start-up costs 11,490  
Excess of book over tax depreciation 1,310,446  
Stock option and restricted stock award expense 1,316,178  
Investment in unconsolidated entity 1,387,970  
Less: valuation allowance (49,235,133) $ (69,481,041)
Deferred tax assets 152,505  
Deferred tax liability:    
Property and equipment basis 43,155  
Prepaid expenses 102,825  
Reserve for accounts receivable Gain loss 6,525  
Deferred tax liabilities 152,505  
Net deferred tax asset $ 0