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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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