XML 37 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9

Convertible Notes Payable to Shareholders - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended
	Apr. 15, 2014	Apr. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Nov. 30, 2010	Mar. 31, 2014	Aug. 31, 2013	Sep. 30, 2010	May 31, 2010
Debt Instrument [Line Items]
Debt instrument, Original principal amount							$ 8,824,000us-gaap_DebtInstrumentFaceAmount
Debt instrument stated interest rate						7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage	7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt instrument percentage	77.50%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
IPO closure date				2014-04-15
Loss on extinguishment of debt		(2,493,000)us-gaap_GainsLossesOnExtinguishmentOfDebt	(2,493,000)us-gaap_GainsLossesOnExtinguishmentOfDebt	(2,493,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt instrument, Original principal amount								1,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	5,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Debt instrument stated interest rate								7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Preferred stock shares became exercisable	60,532us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Fair value of warrants					474,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Expected volatility					80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Expected life					7 years
Risk-free interest rate					1.85%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Dividend yield					$ 0us-gaap_FairValueAssumptionsExpectedDividendPayments / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Convertible Notes Payable [Member] | Series C Convertible Preferred Stock [Member]
Debt Instrument [Line Items]
Debt instrument conversion of principal and accrued interest					176,000us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Debt instrument conversion shares					9,021,175us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Debt instrument conversion price					$ 0.74us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Percentage to determine the number of shares included in warrants					10.00%ceru_PercentageOfNotesConvertedInToShareToDetermineNumberOfSharesInWarrants / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Preferred stock shares became exercisable					878,370us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Preferred stock per share					$ 0.74us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Convertible Promissory Notes [Member] | Existing Investors [Member]
Debt Instrument [Line Items]
Debt instrument, Original principal amount						6,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ceru_DebtInstrumentExistingInvestorsMember / us-gaap_ShortTermDebtTypeAxis = ceru_ConvertiblePromissoryNotesMember
Convertible Promissory Notes [Member] | New Investor [Member]
Debt Instrument [Line Items]
Debt instrument, Original principal amount						2,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ceru_DebtInstrumentNewInvestorMember / us-gaap_ShortTermDebtTypeAxis = ceru_ConvertiblePromissoryNotesMember

X

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Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Risk-free interest rate assumption used in valuing an instrument.

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Fair value portion of warrants not settleable in cash classified as equity.

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