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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
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