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Significant Components of Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 151,100us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 142,500us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credit carryforwards 33,800us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 32,100us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Capitalized research and development 15,500cers_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts 12,300cers_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts
Deferred compensation 5,800us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 4,900us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Capital loss carryforwards 3,700us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 3,900us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other 3,200us-gaap_DeferredTaxAssetsOther 3,300us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 213,100us-gaap_DeferredTaxAssetsGross 199,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (213,100)us-gaap_DeferredTaxAssetsValuationAllowance (199,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Amortization of goodwill 115cers_DeferredTaxLiabilitiesAmortizationOfIntangibleAssets 89cers_DeferredTaxLiabilitiesAmortizationOfIntangibleAssets
Total deferred tax liabilities $ 115us-gaap_DeferredTaxLiabilities $ 89us-gaap_DeferredTaxLiabilities