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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Short-term purchase commitments | $ 21.5
Long-term purchase commitments | $ 3.3

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 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