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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 61,633,401  
Capital loss carryforward 245,098  
Accrued expenses 197,751  
Reserve for accounts receivable 1,062,222  
Start-up costs 25,598  
Excess of book over tax depreciation 2,190,075  
Stock option and restricted stock award expense 2,166,948  
Investment in unconsolidated entity 2,229,210  
Less: valuation allowance (69,481,041) $ (64,553,394)
Deferred tax assets 269,262  
Deferred tax liability:    
Property and equipment basis 69,311  
Prepaid expenses 199,951  
Deferred tax liabilities 269,262  
Net deferred tax asset $ 0