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v3.22.1

Subsequent Event - Additional Information (Detail) | 1 Months Ended
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May 31, 2022
Subsequent Event | Fresenius |
Subsequent Event [Line Items] |
Contract extension period | 10 years

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- Definition Contract extension period. + References No definition available. + Details
Name: | cers_ContractExtensionPeriod
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cers_FreseniusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |