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Available-for-sale Securities (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Carrying Value [Member] |  |
Available-for-sale securities original contractual maturity |  |
Due in one year or less | $ 10,263 | $ 8,683
Due greater than three years and less than five years | 0 | 287
Total available-for-sale securities | 10,263 | 8,970
Fair Value [Member] |  |
Available-for-sale securities original contractual maturity |  |
Due in one year or less | 10,263 | 8,683
Due greater than three years and less than five years | 0 | 287
Total available-for-sale securities | $ 10,263 | $ 8,970

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- Definition Available-for-sale securities by contractual maturity. + References No definition available. + Details
Name: | cers_AvailableForSaleSecuritiesByContractualMaturity
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | cers_AvailableForSaleSecuritiesByContractualMaturityAbstract
Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Available-for-sale securities by contractual maturity due greater than three years and less than five years. + References No definition available. + Details
Name: | cers_AvailableForSaleSecuritiesByContractualMaturityDueGreaterThanThreeYearsAndLessThanFiveYears
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale securities by contractual maturity due in one year. + References No definition available. + Details
Name: | cers_AvailableForSaleSecuritiesByContractualMaturityDueInOneYear
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant