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Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 Tranche | Dec. 31, 2014 | Apr. 30, 2013 | May 31, 2014
Loan and Security Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing limit | $ 30.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Term of agreement | 5 years |  |  |
Number of loan tranches | 3 cers_NumberOfEqualTranches / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Interest rate, description |  | Term Loan A bears an interest rate of 6.95%. Term Loan B and Term Loan C will bear an interest rate calculated at the greater of 6.95% or 6.72% plus the three month U.S. LIBOR rate in effect three business days prior to the applicable Term Loan funding date. |  |
Maturity period |  | Jun. 01, 2019 |  |
Principal and interest payments | 42 months |  |  |
Final payment term percent | 7.00%cers_LineOfCreditFacilityFinalPaymentPercentageOfPrincipalDrawnAtMaturity / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Terms of required periodic payments of interest and principal |  | The Company is required to make interest only payments through December 2015 followed by forty-two months of equal principal and interest payments thereafter; however, if the Revenue Event is achieved no later than November 30, 2015, then the interest-only period may be extended through December 31, 2016, and the amortization period will be reduced to thirty months. The Company is also required to make a final payment equal to 7% of the principal amounts of the Term Loans drawn payable on the earlier to occur of maturity or prepayment. |  |
Commitment fee | 0.2 us-gaap_DebtInstrumentFeeAmount / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Lender legal fees | 0.1 us-gaap_LegalFees / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Loan and Security Agreement | Securities Pledged as Collateral |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Percentage of investments made in subsidiary | 35.00%cers_PercentageOfInvestmentsMadeInSubsidiary / us-gaap_FinancialInstrumentAxis = us-gaap_SecuritiesPledgedAsCollateralMember / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Amended Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maturity period |  | Jun. 30, 2014 |  |
Amended Credit Agreement | Revolving line of credit ("RLOC") |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing limit |  | 7.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember |  |
Loan and security agreement |  |  |  | 3.4 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember
Amended Credit Agreement | Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing limit |  | 5.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = cers_TermLoanMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember |  |
Loan and security agreement |  |  | 5.0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = cers_TermLoanMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember |
Final payment fee for early repayment of credit facility |  |  | 0.05 us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_CreditFacilityAxis = cers_TermLoanMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember |
Repayment of credit facility |  |  | 4.2 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = cers_TermLoanMember / us-gaap_LongtermDebtTypeAxis = cers_AmendedCreditAgreementMember |
First Tranche (Term Loan A) | Loan and Security Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Loan and security agreement | 10.0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cers_FirstTrancheMember / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Interest rate | 6.95%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = cers_FirstTrancheMember / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Second Tranche (Term Loan B) | Loan and Security Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Loan and security agreement | 10.0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cers_SecondTrancheMember / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Borrowing conditions |  | The second tranche of $10.0 million ("Term Loan B") was contingent upon the approval, by the U.S. Food and Drug Administration ("FDA") of the Company's premarket approval application for either the plasma or platelet system (the "PMA Approval"), which occurred in December 2014. The availability of Term Loan B expires on June 15, 2015. |  |
Third Tranche (Term Loan C) | Loan and Security Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Loan and security agreement | $ 10.0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cers_ThirdTrancheMember / us-gaap_LongtermDebtTypeAxis = cers_LoanAndSecurityAgreementMember |  |  |
Borrowing conditions |  | The third tranche of $10.0 million ("Term Loan C") will be available from July 1, 2015 through December 31, 2015, contingent upon the Company achieving trailing six months' revenue at a specified threshold (the "Revenue Event"). |  |

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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