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Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail)
 12 Months Ended
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