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Licensing Agreements - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development | $ 4,701,000 us-gaap_ResearchAndDevelopmentExpense | $ 2,928,000 us-gaap_ResearchAndDevelopmentExpense | $ 2,648,000 us-gaap_ResearchAndDevelopmentExpense | $ 1,495,000 us-gaap_ResearchAndDevelopmentExpense | $ 1,440,000 us-gaap_ResearchAndDevelopmentExpense | $ 1,586,000 us-gaap_ResearchAndDevelopmentExpense | $ 3,195,000 us-gaap_ResearchAndDevelopmentExpense | $ 3,479,000 us-gaap_ResearchAndDevelopmentExpense | $ 11,772,000 us-gaap_ResearchAndDevelopmentExpense | $ 9,700,000 us-gaap_ResearchAndDevelopmentExpense | $ 15,807,000 us-gaap_ResearchAndDevelopmentExpense
Calando Pharmaceuticals, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bankruptcy proceedings, court where petition was filed |  |  |  |  |  |  |  |  | District of Delaware |  |
Bankruptcy petition date filed |  |  |  |  |  |  |  |  | Mar. 03, 2015 |  |
Bankruptcy description |  |  |  |  |  |  |  |  | In March 2014, Calando entered Chapter 7 bankruptcy in the District of Delaware and, as a result, the intellectual property rights the Company has obtained from Calando are subject to potential risks that may arise in connection with bankruptcy. |  |
MIT License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  | 10,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_MassachusettsInstituteOfTechnologyLicenseMember | 10,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_MassachusettsInstituteOfTechnologyLicenseMember | 10,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_MassachusettsInstituteOfTechnologyLicenseMember
Calando Product License Agreement [Member] | Upon achievement of specified regulatory and commercial milestones [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  |  |  | 32,800,000 ceru_LicenseAgreementMilestonePayment / us-gaap_StatementScenarioAxis = ceru_UponAchievementOfSpecifiedRegulatoryAndCommercialMilestonesMember / us-gaap_TypeOfArrangementAxis = ceru_CalandoProductLicenseAgreementMember |  |
Calando Platform License Agreement [Member] | CRLX301 [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  | 250,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_ProductOrServiceAxis = ceru_CRLXThreeZeroOneMember / us-gaap_TypeOfArrangementAxis = ceru_CalandoPlatformLicenseAgreementMember |  |
Calando Platform License Agreement [Member] | Upon achievement of specified regulatory and commercial milestones [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  |  |  | 17,800,000 ceru_LicenseAgreementMilestonePayment / us-gaap_StatementScenarioAxis = ceru_UponAchievementOfSpecifiedRegulatoryAndCommercialMilestonesMember / us-gaap_TypeOfArrangementAxis = ceru_CalandoPlatformLicenseAgreementMember |  |
Calando Platform License Agreement [Member] | Upon initiation of phase one clinical trial [Member] | CRLX301 [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  |  |  | 250,000 ceru_LicenseAgreementMilestonePayment / us-gaap_ProductOrServiceAxis = ceru_CRLXThreeZeroOneMember / us-gaap_StatementScenarioAxis = ceru_UponInitiationOfPhaseOneClinicalTrialMember / us-gaap_TypeOfArrangementAxis = ceru_CalandoPlatformLicenseAgreementMember |  |
SUNY License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  | $ 30,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_SUNYLicenseMember | $ 25,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_SUNYLicenseMember | $ 10,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_TypeOfArrangementAxis = ceru_SUNYLicenseMember

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- Definition United States Bankruptcy Court where petition for bankruptcy was filed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 + Details
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- Definition Date petition for bankruptcy filed with the bankruptcy court, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 + Details
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- Definition Description of the bankruptcy proceedings, including the process for emergence from bankruptcy. Does not include a description of management's plans to improve operations to enable the entity to emerge from bankruptcy, or a description of planned facility closings, business exit activities and headcount reduction plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55696-112764 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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