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Development and License Agreements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Licenses Agreements [Line Items] |  |  |
Royalty payments on products | $ 2.5 us-gaap_PaymentsForRoyalties | $ 3.0 us-gaap_PaymentsForRoyalties | $ 2.7 us-gaap_PaymentsForRoyalties
Prior written notice for termination of agreement | 24 months |  |
Payments made relating to the manufacturing of the products | 19.1 cers_PaymentForManufacturingOfEntityProducts | 15.0 cers_PaymentForManufacturingOfEntityProducts | 12.2 cers_PaymentForManufacturingOfEntityProducts
Amounts due from Fresenius | 1.3 us-gaap_AccountsAndNotesReceivableNet | 0 us-gaap_AccountsAndNotesReceivableNet |
Fresenius |  |  |
Licenses Agreements [Line Items] |  |  |
Prior written notice for termination of agreement | 30 months |  |
Royalty |  |  |
Licenses Agreements [Line Items] |  |  |
Royalties owed | 0.7 us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_RoyaltyAgreementsMember | 0.7 us-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 | $ 5.1 us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cers_ManufacturingAndSupplyAgreementsMember | $ 4.3 us-gaap_AccruedRoyaltiesCurrentAndNoncurrent / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cers_ManufacturingAndSupplyAgreementsMember |

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. + References 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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