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Commitments and Contingencies - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
EUR (€)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2014
Additional Concord Lease
Option
Commitments and Contingencies Disclosure [Line Items]            
Minimum term of non-cancellable operating leases 1 year 1 year        
Expiration of non-cancellable operating leases maximum year 2019 2019        
Early termination of non-cancellable operating leases minimum period           2016-02
Initial term of operating lease           2 years
Number of renewal options           4cers_OperatingLeaseNumberOfAdditionalRenewalOption
/ us-gaap_LeaseArrangementTypeAxis
= cers_AdditionalConcordLeaseMember
Renewal period of operating lease           2 years
Operating lease, rent expense $ 0.8us-gaap_OperatingLeasesRentExpenseMinimumRentals   $ 0.7us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 0.6us-gaap_OperatingLeasesRentExpenseMinimumRentals    
Financing for leasehold improvement         1.1cers_ProceedsFromLandlordFinancingLeaseholdImprovement  
Outstanding liability related to leasehold improvements 0.6cers_OutstandingLiabilityRelatedToLeaseholdImprovementsCurrentAndNonCurrent          
Leasehold Improvements reflected in Accrued liabilities 0.1cers_LeaseholdImprovementReflectedInAccruedLiabilities          
Leasehold Improvements reflected in Other non-current liabilities 0.5cers_LeaseholdImprovementReflectedInOtherNonCurrentLiabilities          
Purchase commitment, paid 6.8cers_PurchaseCommitmentPayments   6.5cers_PurchaseCommitmentPayments 7.2cers_PurchaseCommitmentPayments    
Future minimum purchase commitment 2015 8.5cers_LongTermPurchaseCommitmentAmountDueWithinOneYear          
Future minimum purchase commitment 2016 2.3cers_LongTermPurchaseCommitmentAmountDueWithinTwoYears          
Transition agreement expiration date Sep. 30, 2014 Sep. 30, 2014        
Distribution fee per disposable kit 10cers_SalesCommissionsAndFeesPerUnit 10cers_SalesCommissionsAndFeesPerUnit        
Potential maximum payment of distribution fee   3us-gaap_SalesCommissionsAndFees        
Distribution related expense accrued $ 0.1cers_SalesAndMarketingRelatedExpensesAccrued