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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 45,685,747  
Capital loss carryforward 395,844  
Accrued expenses 111,181  
Deferred revenue 1,020,246  
Reserve for accounts receivable 2,146,685  
Reserve for inventory 133,608  
Start-up costs 110,118  
Excess of book over tax depreciation 1,359,211  
Stock option and restricted stock award expense 1,659,421  
Investment in unconsolidated entity 3,800,697  
Less: valuation allowance (55,726,704) (57,901,529)
Deferred tax assets 696,054  
Deferred tax liability:    
Property and equipment basis 71,229  
Prepaid expenses 624,825  
Deferred tax liabilities 696,054  
Net deferred tax asset $ 0