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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

X

- Definition

Available-for-sale securities by contractual maturity.

+ References

No definition available.

+ Details

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Namespace Prefix:	cers_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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