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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]    
Net operating loss carryforwards $ 37,513us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 33,654us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credit carryforwards 10,615us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 10,498us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Intangibles 395us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 337us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Other 2,527us-gaap_DeferredTaxAssetsOther 2,867us-gaap_DeferredTaxAssetsOther
Deferred tax assets, gross 51,050us-gaap_DeferredTaxAssetsGross 47,356us-gaap_DeferredTaxAssetsGross
Valuation allowance (50,724)us-gaap_DeferredTaxAssetsValuationAllowance (47,350)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 326us-gaap_DeferredTaxAssetsNet 6us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities $ 326us-gaap_DeferredTaxAssetsLiabilitiesNet $ 6us-gaap_DeferredTaxAssetsLiabilitiesNet