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Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Etablissement Francais du Sang |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 25.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_EtablissementFrancaisDuSangMember | 17.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_EtablissementFrancaisDuSangMember | 20.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_EtablissementFrancaisDuSangMember
Grifols |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue |  | 18.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_GrifolsMember | 19.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_GrifolsMember
Delrus Inc. |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue |  |  | 12.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_DelrusIncMember

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- Definition Concentration Risk Percentage Of Revenues By Single Customer + References No definition available. + Details
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