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Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Deferred Income Tax Assets And Liabilities [Line Items]    
Total, current $ 924,088 $ 773,074
Valuation allowance, current (924,088) (773,074)
Net deferred tax asset, current 0 0
Total 14,092,783 14,111,224
Valuation allowance (14,092,783) (14,111,224)
Net deferred tax asset 0 0
Deferred Tax Assets Current
   
Deferred Income Tax Assets And Liabilities [Line Items]    
Bad debt and inventory reserve 88,077 41,243
Accrued liabilities 836,011 731,831
Deferred Tax Assets Noncurrent
   
Deferred Income Tax Assets And Liabilities [Line Items]    
Deferred revenue 59,673  
Depreciation and amortization 1,024,784 1,005,697
Net operating loss carryforwards 10,896,286 11,358,044
Research and development credits 386,161 386,161
Deferred compensation 163,655 123,797
Stock-based compensation 1,519,513 1,208,970
AMT credit $ 42,711 $ 28,555