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Revenue - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue Recognition Milestone Method [Line Items]
Revenue	$ 33,000us-gaap_Revenues	$ 47,000us-gaap_Revenues	$ 6,000us-gaap_Revenues	$ 80,000us-gaap_Revenues	$ 6,000us-gaap_Revenues	$ 625,000us-gaap_Revenues
Material Transfer Agreement [Member]
Revenue Recognition Milestone Method [Line Items]
Revenue				61,000us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = ceru_MaterialTransferAgreementMember	6,000us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = ceru_MaterialTransferAgreementMember	625,000us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = ceru_MaterialTransferAgreementMember
Material Transfer Agreement One [Member]
Revenue Recognition Milestone Method [Line Items]
Revenue				$ 19,000us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = ceru_MaterialTransferAgreementOneMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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 210.5-03.1)

-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 1

-Article 5

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