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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 |  |  |  |  |  |  | $ 8,824,000 us-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 |  |  |  |  |  |  |  | 1,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 5,000,000 us-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 | 60,532 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |  |  |  |
Fair value of warrants |  |  |  |  | 474,000 us-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 |  |  |  |  | $ 0 us-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 |  |  |  |  | 176,000 us-gaap_DebtConversionOriginalDebtAmount1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Debt instrument conversion shares |  |  |  |  | 9,021,175 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Debt instrument conversion price |  |  |  |  | $ 0.74 us-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 |  |  |  |  | 878,370 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ShortTermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Preferred stock per share |  |  |  |  | $ 0.74 us-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 |  |  |  |  |  | 6,000,000 us-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 |  |  |  |  |  | 2,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ceru_DebtInstrumentNewInvestorMember / us-gaap_ShortTermDebtTypeAxis = ceru_ConvertiblePromissoryNotesMember |  |  |

X
- Definition Percentage of notes converted in to share to determine number of shares in warrants. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The amount of 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 cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition A description of the time period when the company made its initial offering of a class of securities. + References No definition available. + Details
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- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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