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Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail) | 3 Months Ended
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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 + References No definition available. + Details
Name: | cers_ConcentrationRiskPercentageOfRevenuesBySingleCustomer
Namespace Prefix: | cers_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=cers_EtablissementFrancaisDuSangMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=cers_GrifolsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |