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Fair Value of Warrants Outstanding (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Class of Warrant or Right [Line Items] |  |
Warrant liability | $ 10,485,000 us-gaap_WarrantsAndRightsOutstanding | $ 20,390,000 us-gaap_WarrantsAndRightsOutstanding
2009 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant liability |  | 8,542,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandNineWarrantsMember
2010 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrant liability | $ 10,485,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenWarrantsMember | $ 11,848,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenWarrantsMember

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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 + Details
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