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Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2023 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	$ 30.7
Long-term purchase commitments	$ 7.2

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
-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

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