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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:      
Net operating loss and tax credit carryforwards $ 42,412,630    
Capital loss carryforward 385,188    
Accrued expenses 62,672    
Deferred revenue 644,367    
Reserve for accounts receivable 2,048,105    
Reserve for inventory return 130,012    
Stock option and restricted stock awards 907,476    
Start-up costs 107,154    
Excess of book over tax depreciation 1,428,417    
Investment - unconsolidated entity 3,687,310    
Less: valuation allowance (51,625,159) (57,901,529) (52,515,797)
Deferred tax assets 188,172    
Deferred tax liability:      
Prepaid expenses 118,860    
Property and equipment basis 69,312    
Deferred tax liabilities 188,172    
Net deferred tax asset $ 0