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v3.25.3

Leases - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2025
Leases [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.

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
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
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 -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
Name: | us-gaap_LessorOperatingLeaseLeaseNotYetCommencedDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration