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Income Taxes - Significant Components of Company's Deferred Taxes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 29,442us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	$ 25,696us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credit carryforwards	1,715us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch	1,525us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Capitalized costs	3,503us-gaap_DeferredTaxAssetsTaxDeferredExpense	3,067us-gaap_DeferredTaxAssetsTaxDeferredExpense
Capitalized research and development costs	9,938ceru_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCost	6,992ceru_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCost
Other	422us-gaap_DeferredTaxAssetsOther	220us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	45,020us-gaap_DeferredTaxAssetsGross	37,500us-gaap_DeferredTaxAssetsGross
Valuation allowance	(45,020)us-gaap_DeferredTaxAssetsValuationAllowance	(37,500)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

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