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Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Minimum term of non-cancellable operating leases	1 year
Expiration of non-cancellable operating leases maximum year	2019
Financing for leasehold improvement		$ 1,100,000cers_ProceedsFromLandlordFinancingLeaseholdImprovement
Outstanding liability related to leasehold improvements	600,000cers_OutstandingLiabilityRelatedToLeaseholdImprovementsCurrentAndNonCurrent
Leasehold Improvements reflected in Accrued liabilities	100,000cers_LeaseholdImprovementReflectedInAccruedLiabilities
Leasehold Improvements reflected in Other non-current liabilities	500,000cers_LeaseholdImprovementReflectedInOtherNonCurrentLiabilities
Additional Concord Lease
Commitments and Contingencies Disclosure [Line Items]
Initial term of operating lease	2 years
Number of renewal options	4cers_OperatingLeaseNumberOfAdditionalRenewalOption / us-gaap_LeaseArrangementTypeAxis = cers_AdditionalConcordLeaseMember
Renewal period of operating lease	2 years
Future rent payment, 2015	121,136us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear / us-gaap_LeaseArrangementTypeAxis = cers_AdditionalConcordLeaseMember
Future rent payment, 2016	172,592us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = cers_AdditionalConcordLeaseMember
Future rent payment, 2017	$ 105,056us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LeaseArrangementTypeAxis = cers_AdditionalConcordLeaseMember

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- Definition

Latest period of expiration of non-cancelable operating lease.

+ References

No definition available.

+ Details

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- Definition

Portion of outstanding liability related to leasehold improvement reflected in accrued liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	cers_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Portion of outstanding liability related to leasehold improvement reflected in other non current liabilities.

+ References

No definition available.

+ Details

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- Definition

Minimum term of non-cancelable operating lease.

+ References

No definition available.

+ Details

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- Definition

Operating Lease Number Of Additional Renewal Option

+ References

No definition available.

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- Definition

Outstanding liability related to leasehold improvements current and non current.

+ References

No definition available.

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- Definition

Proceeds from landlord for financing leasehold improvement.

+ References

No definition available.

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Balance Type:	debit
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- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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