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Stockholders Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2010 | Jun. 12, 2014 | Aug. 31, 2009
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |
Common stock, shares authorized | 225,000,000 us-gaap_CommonStockSharesAuthorized | 112,500,000 us-gaap_CommonStockSharesAuthorized |  |  | 112,500,000 us-gaap_CommonStockSharesAuthorized |
Warrant liability | $ 10,485,000 us-gaap_WarrantsAndRightsOutstanding | $ 20,390,000 us-gaap_WarrantsAndRightsOutstanding |  |  |  |
Proceeds from common stock sold | 18,488,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 61,425,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 14,226,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
2009 Unit Offering |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock |  |  |  |  |  | 2,400,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandNineUnitOfferingMember
Warrant exercise price |  |  |  |  |  | $ 2.90 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandNineUnitOfferingMember
Warrant liability | 0 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandNineUnitOfferingMember |  |  |  |  |
2010 Unit Offering |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock |  |  |  | 3,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember |  |
Warrant exercise price |  |  |  | 3.20 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember |  |
Warrant liability | 3,300,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember |  |  |  |  |
2010 Unit Offering | Warrant |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants exercisable date |  |  |  | May 15, 2011 |  |
Exercisable period |  |  |  | 5 years |  |
Warrants exercised | 2,600,000 cers_WarrantsExercised / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 200,000 cers_WarrantsExercised / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 5,000 cers_WarrantsExercised / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |  |
Stockholder Rights Plan |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Minimum percentage of common stock acquired by stockholders | 15.00%cers_MinimumPercentageOfCommonStockAcquiredByStockholders / us-gaap_StatementClassOfStockAxis = cers_StockholderRightsPlanMember |  |  |  |  |
Designated preferred stock for future issuance | 250,000 cers_DesignatedPreferredStockForFutureIssuance / us-gaap_StatementClassOfStockAxis = cers_StockholderRightsPlanMember |  |  |  |  |
Sales Agreement | Cantor |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Maximum common stock offering price | 70,000,000 cers_MaximumAmountAvailableUnderOffering / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember |  |  |  |  |
Percentage of proceeds payable as compensation to underwriter | 2.00%cers_PercentageOfProceedsPayableAsCompensationToUnderwriter / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember |  |  |  |  |
Common stock, number of shares issued | 4,300,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember | 5,400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember |  |  |  |
Proceeds from common stock sold | 18,600,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember | 23,500,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember |  |  |  |
Common stock available for sale | $ 22,500,000 cers_CommonStockSharesAvailableForSaleValue / dei_LegalEntityAxis = cers_CantorMember / us-gaap_StatementClassOfStockAxis = cers_SalesAgreementMember |  |  |  |  |

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