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Segment, Customer and Geographic Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Movaco, S.A. [Member] |  |  |  |
Customers that accounted for more than 10% of the Company's total product revenue |  |  |  |
Company's total product revenue from significant customers | 21.00% | 27.00% | 19.00% | 27.00%
Etablissement Francais du Sang [Member] |  |  |  |
Customers that accounted for more than 10% of the Company's total product revenue |  |  |  |
Company's total product revenue from significant customers | 19.00% | 15.00% | 24.00% | 20.00%
AUM+ LTD [Member] |  |  |  |
Customers that accounted for more than 10% of the Company's total product revenue |  |  |  |
Company's total product revenue from significant customers | 13.00% |  |  |
Delrus Inc. [Member] |  |  |  |
Customers that accounted for more than 10% of the Company's total product revenue |  |  |  |
Company's total product revenue from significant customers |  |  | 13.00% |

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- Details
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Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration