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Stockholders Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended
Jan. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Nov. 30, 2010
Dec. 31, 2014
Aug. 31, 2009
Stockholders Equity Note [Line Items]            
Common stock, number of shares issued 14,636,363us-gaap_StockIssuedDuringPeriodSharesNewIssues          
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare          
Public offering, price per share $ 5.50us-gaap_SharePrice          
Estimated Net proceeds from public offering $ 75,400,000cers_EstimatedNetProceedsFromPublicOffering          
Underwriting discounts and other issuance costs 5,100,000us-gaap_PaymentsOfStockIssuanceCosts          
Gain (Loss) from revaluation of warrant liability   6,300,000cers_WarrantLiabilityRevaluationGainLoss 9,000,000cers_WarrantLiabilityRevaluationGainLoss      
Proceeds from common stock sold   75,527,000us-gaap_ProceedsFromIssuanceOfCommonStock 31,000us-gaap_ProceedsFromIssuanceOfCommonStock      
2009 Unit Offering            
Stockholders Equity Note [Line Items]            
Warrants to purchase an aggregate shares of common stock           2,400,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandNineUnitOfferingMember
Warrant exercise price           $ 2.90us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandNineUnitOfferingMember
2010 Unit Offering            
Stockholders Equity Note [Line Items]            
Warrants to purchase an aggregate shares of common stock       3,700,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandTenUnitOfferingMember		    
Warrant exercise price       3.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ 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   0cers_WarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandTenUnitOfferingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		        
Sales Agreement | Cantor            
Stockholders Equity Note [Line Items]            
Common stock, number of shares issued   0us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= cers_CantorMember
/ us-gaap_StatementClassOfStockAxis
= cers_SalesAgreementMember		     4,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= cers_CantorMember
/ us-gaap_StatementClassOfStockAxis
= cers_SalesAgreementMember		  
Maximum common stock offering price   70,000,000cers_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		        
Proceeds from common stock sold   18,600,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= cers_CantorMember
/ us-gaap_StatementClassOfStockAxis
= cers_SalesAgreementMember		        
Common stock available for sale   $ 22,500,000cers_CommonStockSharesAvailableForSaleValue
/ dei_LegalEntityAxis
= cers_CantorMember
/ us-gaap_StatementClassOfStockAxis
= cers_SalesAgreementMember