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Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Disclosure - Significant Accounting Policies - Additional Information (Detail) [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
Number of operating segments				1us-gaap_NumberOfOperatingSegments
Restricted cash			117,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	117,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	117,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Facility lease scheduled expiration period				2016-02
Sydney, NSW [Member]
Disclosure - Significant Accounting Policies - Additional Information (Detail) [Line Items]
Revenue				0us-gaap_Revenues / us-gaap_StatementGeographicalAxis = ceru_SydneyMember
Long-lived assets				$ 0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = ceru_SydneyMember

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Lease expiration period, month and year.

+ References

No definition available.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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

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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



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-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 5

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