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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Movaco, S.A. |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 18.00% | 19.00% | 21.00%
Etablissement Francais du Sang |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue | 17.00% | 20.00% | 24.00%
Delrus Inc. |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue derived from significant customer from Company's total product revenue |  | 12.00% | 12.00%

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- Definition Concentration Risk Percentage Of Revenues By Single Customer + References No definition available. + Details
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Namespace Prefix: | cers_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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