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Income Taxes - Reconciliation of Income Tax Expense Computed at Statutory Federal Income Tax Rate to Income Taxes (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax, net of federal benefit	4.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences	(3.70%)ceru_EffectiveIncomeTaxRateReconciliationPermanentDifferences	0.20%ceru_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Research and development credit	0.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	1.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Stock compensation	(0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Expiration of state net operating loss	(1.70%)ceru_EffectiveIncomeTaxRateReconciliationExpirationOfStateNetOperatingLoss	(4.20%)ceru_EffectiveIncomeTaxRateReconciliationExpirationOfStateNetOperatingLoss
Other	(0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Change in valuation allowance	(32.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(35.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective income tax rate	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Effective Income Tax Rate Reconciliation Expiration of State Net Operating Loss.

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Effective income tax rate reconciliation, permanent differences.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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