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Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Domestic net operating loss carryforwards $ 20,598,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic $ 15,627,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Foreign net operating loss carryforwards 802,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Deferred revenue 0us-gaap_DeferredTaxAssetsDeferredIncome 0us-gaap_DeferredTaxAssetsDeferredIncome
Federal and state tax credit 297,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 297,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Stock-based compensation 803,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 682,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Capitalized costs 1,164,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 1,232,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Other, net 1,581,000us-gaap_DeferredTaxAssetsOther 2,129,000us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 25,245,000us-gaap_DeferredTaxAssetsGross 20,767,000us-gaap_DeferredTaxAssetsGross
Less valuation allowance on deferred tax assets (25,245,000)us-gaap_DeferredTaxAssetsValuationAllowance (20,767,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred taxes 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Plant and equipment, principally accelerated depreciation 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities 0us-gaap_DeferredIncomeTaxLiabilities 0us-gaap_DeferredIncomeTaxLiabilities
Net deferred taxes $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet