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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 56,241,535  
Capital loss carryforward 86,971  
Accrued expenses 349,770  
Reserve for accounts receivable 1,062,222  
Start-up costs 107,153  
Excess of book over tax depreciation 2,773,114  
Stock option and restricted stock award expense 1,897,193  
Investment in unconsolidated entity 2,229,210  
Less: valuation allowance (64,553,394) $ (60,312,726)
Deferred tax assets 193,774  
Deferred tax liability:    
Property and equipment basis 69,311  
Prepaid expenses 124,463  
Deferred tax liabilities 193,774  
Net deferred tax asset $ 0