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Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	26.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_EtablissementFrancaisDuSangMember		23.00%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		[1]	19.00%cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer / us-gaap_MajorCustomersAxis = cers_GrifolsMember
[1] Represents an amount less than 10% of product revenue.

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- Definition

Concentration Risk Percentage Of Revenues By Single Customer

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Data Type:	na
Balance Type:
Period Type:

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- Details

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Period Type: