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Segment, Customer and Geographic Information (Tables) | 3 Months Ended
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Mar. 31, 2013
Customers that Accounted for More Than Ten Percent of Total Product Revenue | The Company had the following significant customers that accounted for more than 10% of the Company’s total product revenue, all of which operate in a country outside of the United States, during the three months ended March 31, 2013 and 2012 (in percentages):
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Delrus Inc. |  |  | 19 | % |  |  | 17 | %
Movaco, S.A. |  |  | 16 | % |  |  | 18 | %
Etablissement Francais du Sang |  |  | 16 | % |  |  | 30 | %

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- Definition Customers that accounted for more than ten percentage of company's total product revenue. + References No definition available. + Details
Name: | cers_CustomersThatAccountedForMoreThanTenPercentageOfCompanysProductRevenueTableTextBlock
Namespace Prefix: | cers_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration