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Long-Term Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment [Line Items]
Eligibility to receive a royalty fee	1.00%cers_EligibleToReceiveRoyaltyFee
Royalty income, nonoperating	$ 0us-gaap_InvestmentIncomeNonoperating	$ 0us-gaap_InvestmentIncomeNonoperating	$ 0us-gaap_InvestmentIncomeNonoperating
Carrying value of investment	$ 0us-gaap_CostMethodInvestments
Maximum
Investment [Line Items]
Ownership percentage under Cost Method for Investments	1.00%cers_OwnershipPercentageUnderCostMethodInvestments / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Eligible to receive a royalty fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	cers_
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Balance Type:	na
Period Type:	duration

X

- Definition

Ownership percentage of investee's common stock using the cost method.

+ References

No definition available.

+ Details

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Namespace Prefix:	cers_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

+ Details

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Balance Type:	credit
Period Type:	duration

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- Details

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