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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items] |  |
Minimum term of non-cancellable operating leases | 1 year |
Expiration of non-cancellable operating leases maximum year | 2029 |
Financing for leasehold improvement |  | $ 1.1
Outstanding liability related to leasehold improvements | $ 0.2 |
Accrued liabilities |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Leasehold Improvements reflected in Accrued liabilities | 0.1 |
Other non-current liabilities |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Leasehold Improvements reflected in Other non-current liabilities | $ 0.1 |

X
- Definition Portion of outstanding liability related to leasehold improvement reflected in accrued liabilities. + References No definition available. + Details
Name: | cers_AccruedLeaseholdImprovementsCurrent
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Outstanding liability related to leasehold improvements current and non current. + References No definition available. + Details
Name: | cers_AccruedLeaseholdImprovementsCurrentAndAccruedLeaseholdImprovementsNoncurrent
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Portion of outstanding liability related to leasehold improvement reflected in other non current liabilities. + References No definition available. + Details
Name: | cers_AccruedLeaseholdImprovementsNoncurrent
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
Name: | cers_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Latest period of expiration of non-cancelable operating lease. + References No definition available. + Details
Name: | cers_ExpirationOfNonCancelableOperatingLeasesMaximumYear
Namespace Prefix: | cers_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum term of non-cancelable operating lease. + References No definition available. + Details
Name: | cers_MinimumTermOfNonCancelableOperatingLeases
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from landlord for financing leasehold improvement. + References No definition available. + Details
Name: | cers_ProceedsFromLandlordFinancingLeaseholdImprovement
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=cers_AccruedLiabilitiesCurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |