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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($)
Commitments And Contingencies Disclosure [Abstract] |
Minimum term of non-cancellable operating leases | 1 year
Expiration of non-cancellable operating leases maximum year | 2030
Operating lease not yet commenced | the Company had no leases that have not yet commenced.
Short-term purchase commitments | $ 23.4
Long-term purchase commitments | $ 2.7

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 Short-term purchase commitment amount. + References No definition available. + Details
Name: | cers_ShortTermPurchaseCommitmentAmount
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of lessor's operating lease that has not yet commenced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseLeaseNotYetCommencedDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration