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Loan Agreements - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended |  |
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Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2008 | Aug. 31, 2008 | Aug. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Aug. 31, 2012 | Aug. 31, 2013 | Apr. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from loans payable |  |  |  |  |  |  |  | $ 10,000,000 us-gaap_ProceedsFromNotesPayable |  |  |  |  |  |  |  |
Debt instrument stated interest rate | 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Fair value of outstanding warrants |  | 928,000 us-gaap_WarrantsAndRightsOutstanding |  |  |  |  | 928,000 us-gaap_WarrantsAndRightsOutstanding |  |  |  |  |  |  |  |  |
Fair value adjustment of warrant liability | (504,000)us-gaap_FairValueAdjustmentOfWarrants | 42,000 us-gaap_FairValueAdjustmentOfWarrants | 7,000 us-gaap_FairValueAdjustmentOfWarrants | (20,000)us-gaap_FairValueAdjustmentOfWarrants | (231,000)us-gaap_FairValueAdjustmentOfWarrants | (504,000)us-gaap_FairValueAdjustmentOfWarrants | (202,000)us-gaap_FairValueAdjustmentOfWarrants | (39,000)us-gaap_FairValueAdjustmentOfWarrants |  |  |  |  |  |  |  |
Accrued interest |  | 234,000 ceru_DebtInstrumentAccruedInterest |  |  |  | 574,000 ceru_DebtInstrumentAccruedInterest | 234,000 ceru_DebtInstrumentAccruedInterest |  |  |  |  |  |  |  |  |
Noncurrent accrued interest |  | 391,000 us-gaap_InterestPayableCurrentAndNoncurrent |  |  |  |  | 391,000 us-gaap_InterestPayableCurrentAndNoncurrent |  |  |  |  |  |  |  |  |
Loan and Security Agreement with Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and security agreement, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 1,500,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |  |  |  |  |  |
Proceeds from loans payable |  |  |  |  |  |  |  |  | 695,000 us-gaap_ProceedsFromNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |  |  |  |  |  |  |
Loan and security agreement, borrowings repayment period |  |  |  |  |  |  |  |  | 48 months |  |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  |  | 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |  |  |  |  |  |  |
Loan and Security Agreement with Bank [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,695 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Loan and Security Agreement with Bank [Member] | Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  |  |  |  |  |  |  | 15,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Exercise price of warrant |  |  |  |  |  |  |  |  |  | $ 2.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Warrant expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Fair value of outstanding warrants |  |  |  |  |  |  |  |  |  | 25,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Expected volatility |  |  |  |  |  |  |  |  |  | 79.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Contractual life |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  | 3.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Expected dividends |  |  |  |  |  |  |  |  |  | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Loan and Security Agreement with Lighthouse Capital Partners VI, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and security agreement, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |  |  |
Proceeds from loans payable |  |  |  |  |  |  |  |  |  |  | 5,000,000 us-gaap_ProceedsFromNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember | 5,000,000 us-gaap_ProceedsFromNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |  | 10,000,000 us-gaap_ProceedsFromNotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |  |
Loan and security agreement, borrowings repayment period |  |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |  |  |
Loan and security agreement, borrowings repayment start date |  |  |  |  |  | Dec. 01, 2012 |  |  |  |  |  |  |  |  |  |
Line of credit facility, additional interest payment |  |  |  |  |  | 600,000 us-gaap_LineOfCreditFacilityIncreaseAccruedInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  |  |  |
Loan and Security Agreement with Lighthouse Capital Partners VI, L.P. [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,436 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Loan and Security Agreement with Lighthouse Capital Partners VI, L.P. [Member] | Series D Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  |  |  |  |  |  |  |  |  |  | 66,436 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Exercise price of warrant |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.04 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Warrant expiration period |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Fair value of outstanding warrants |  |  |  |  |  |  |  |  |  |  | $ 178,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 182,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 284,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 178,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |
Expected volatility |  |  |  |  |  |  |  |  |  |  | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Contractual life |  |  |  |  |  |  |  |  |  |  | 9 years 3 months 15 days | 9 years 8 months 9 days | 10 years |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  | 1.68%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 2.17%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 1.98%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Warrant exercisable for preferred stock, shares |  | 66,436 ceru_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercisable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  | 66,436 ceru_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercisable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 66,436 ceru_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercisable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  | 29,067 ceru_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercisable / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |
Warrant expiration date |  |  |  |  |  | 2021-12 |  |  |  |  |  |  |  |  |  |

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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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