XML 57 R40.htm IDEA: XBRL DOCUMENT
v3.20.2

Debt - Additional Information (Detail) | Mar. 29, 2019 USD ($) Tranche | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Term Loan Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | $ 70,000,000 |  |
Number of loan tranches | Tranche | 3 |  |
Debt instrument maturity date | Mar. 01, 2024 |  |
Term Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument floating interest rate percentage | 1.80% |  |
Effective interest rate |  | 7.50% |
Interest-only payments date | Mar. 01, 2022 |  |
Principal plus declining interest payments | 24 months |  |
Interest only payment period | 12 months |  |
Trailing net revenue target period | 12 months |  |
Term Loan Credit Agreement | Tranche 1 |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | $ 40,000,000.0 |  |
Term Loan Credit Agreement | Tranche 2 | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Loan and security agreement available upon revenue achievement | 15,000,000.0 |  |
Term Loan Credit Agreement | Tranche 3 | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Loan and security agreement available upon revenue achievement | 15,000,000.0 |  |
Prior Loan Agreement | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Repayments principal and interest aggregate amount | 31,200,000 |  |
Prepayment fees in aggregate amount | 600,000 |  |
Prior Loan Agreement | Interest Expense | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Extinguishment loss recorded | 2,100,000 |  |
Revolving Loan Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | 5,000,000.0 | $ 5,000,000.0 | $ 5,000,000.0
Loan and security agreement available upon revenue achievement | $ 15,000,000.0 |  |
Debt instrument floating interest rate percentage | 1.80% |  |
Revolving Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date | Mar. 01, 2024 |  |

X
- Definition Debt instrument, available amount upon condition. + References No definition available. + Details
Name: | cers_DebtInstrumentAvailableAmountUponCondition
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument interest only payments date. + References No definition available. + Details
Name: | cers_DebtInstrumentInterestOnlyPaymentsDate
Namespace Prefix: | cers_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument principal and declining interest payments additional period. + References No definition available. + Details
Name: | cers_DebtInstrumentPrincipalAndDecliningInterestPaymentsAdditionalPeriod
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt prepayment fee. + References No definition available. + Details
Name: | cers_DebtPrepaymentFee
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest only payment period. + References No definition available. + Details
Name: | cers_InterestOnlyPaymentPeriod
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equal tranches. + References No definition available. + Details
Name: | cers_NumberOfEqualTranches
Namespace Prefix: | cers_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Repayments principal and interest aggregate amount. + References No definition available. + Details
Name: | cers_RepaymentsPrincipalAndInterestAggregateAmount
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Trailing net revenue target. + References No definition available. + Details
Name: | cers_TrailingNetRevenueTarget
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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/disclosureRef -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=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cers_TermLoanCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=cers_TwoThousandNineteenTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cers_TrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cers_TrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cers_TrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cers_OxfordTermLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=cers_TwoThousandSeventeenTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |