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Fair Value of Warrants Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Class of Warrant or Right [Line Items]
Warrant liability	$ 4,189us-gaap_WarrantsAndRightsOutstanding	$ 10,485us-gaap_WarrantsAndRightsOutstanding	[1]
2010 Warrants
Class of Warrant or Right [Line Items]
Warrant liability	$ 4,189us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenWarrantsMember	$ 10,485us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenWarrantsMember
[1] The financial information in this column was derived from audited financial statements included in the Company's 2014 Annual Report on Form 10-K.

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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