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Segment, Customer and Geographic Information (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2013, and 2012 (in percentages):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Etablissement Francais du Sang |  |  | 18 | % |  |  | 19 | % |  |  | 17 | % |  |  | 24 | %
Movaco, S.A. |  |  | 14 | % |  |  | 21 | % |  |  | 15 | % |  |  | 19 | %
Bravo Pacific Limited |  |  | 14 | % |  |  |  | * |  |  |  | * |  |  |  | *
AUM+ LTD |  |  | 10 | % |  |  | 13 | % |  |  |  | * |  |  |  | *
Delrus Inc. |  |  |  | * |  |  |  | * |  |  | 11 | % |  |  | 13 | %
* | Represents an amount less than 10% of product revenue.

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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