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Development and License Agreements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Licenses Agreements [Line Items]
Royalty payments on products	$ 0.7us-gaap_PaymentsForRoyalties	$ 0.7us-gaap_PaymentsForRoyalties
Prior written notice for termination of agreement	24 months
Revenue from sale of components	0.4us-gaap_OtherSalesRevenueNet
Payments made relating to the manufacturing of the products	4.7cers_PaymentForManufacturingOfEntityProducts	4.6cers_PaymentForManufacturingOfEntityProducts
Amounts due from Fresenius	1.4us-gaap_AccountsAndNotesReceivableNet		1.3us-gaap_AccountsAndNotesReceivableNet
Fresenius
Licenses Agreements [Line Items]
Prior written notice for termination of agreement	30 months
Royalty
Licenses Agreements [Line Items]
Royalties owed	0.5us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_RoyaltyAgreementsMember		0.7us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_RoyaltyAgreementsMember
Royalty | Platelet system
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products	10.00%cers_RoyaltyRateAppliedTowardsSaleOfProducts / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_RoyaltyAgreementsMember / us-gaap_ProductOrServiceAxis = cers_ZeroPointOneOfProductSalesForPlateletSystemMember
Royalty | Plasma system
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products	3.00%cers_RoyaltyRateAppliedTowardsSaleOfProducts / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_RoyaltyAgreementsMember / us-gaap_ProductOrServiceAxis = cers_ZeroPointZeroThreeOfProductSalesForPlasmaSystemMember
Manufacturing Costs
Licenses Agreements [Line Items]
Royalties owed	$ 3.7us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cers_ManufacturingAndSupplyAgreementsMember		$ 5.1us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cers_ManufacturingAndSupplyAgreementsMember

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a),(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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The amount of cash paid for royalties during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

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