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Subsequent Events - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 08, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Subsequent Event [Line Items] |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 30,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |
Debt Instrument, interest rate terms | The Term Loan will mature on July 1, 2018. Each advance under the Term Loan accrues interest at a floating per annum rate equal to the greater of (i) 7.30% or (ii) the sum of 7.30% plus the prime rate minus 5.75%. The Term Loan provides for interest-only payments on a monthly basis until December 31, 2015 |  |  |
Long-term debt, maturities, prepayment terms |  | Any such prepayment of the Term Loan is subject to a prepayment charge of (i) 3.0% if such prepayment occurs within twelve months of the Closing Date, (ii) 2.0% if such prepayment occurs after twelve months following the Closing Date but on or prior to twenty-four months following the Closing Date, and (iii) 1.0% thereafter |  |
Additional interest rate accrue on default |  | 5.00%ceru_DebtInstrumentAdditionalInterestRateAccrueOnDefault |  |
Interest rate of final payment on principal amount |  | 6.70%ceru_DebtInstrumentInterestRateOfFinalPaymentOnPrincipalAmount |  |
Purchase of common stock, shares |  | 20,125,049 us-gaap_CommonStockSharesIssued | 785,531 us-gaap_CommonStockSharesIssued |
Proceeds from sale of common stock |  | 140,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 35,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,000 us-gaap_ProceedsFromIssuanceOfCommonStock
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of tranches | 3 ceru_NumberOfTranches / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Subsequent Event | Maximum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from Issuance or Sale of Equity | 40,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Subsequent Event | Minimum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amount of term loan facility required to be drawn | 3,000,000 ceru_AmountOfTermLoanFacilityRequiredToBeDrawn / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Hercules Technology Growth Capital, Inc. [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan and security agreement, maximum borrowing capacity | 26,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Common stock per share | $ 6.05 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Conversion of preferred warrants to common warrants. | 137,521 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Class of additional warrant or right number of securities called by warrants or rights | 34,380 ceru_ClassOfAdditionalWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Class of warrant or right, date from which warrants or rights exercisable | Jan. 08, 2020 |  |  |
Purchase of common stock, shares | 135,501 us-gaap_CommonStockSharesIssued / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Purchase price of common share | $ 7.38 us-gaap_SharesIssuedPricePerShare / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Proceeds from sale of common stock | 1,000,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_LineOfCreditFacilityAxis = ceru_HerculesTechnologyGrowthCapitalIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Borrowings One [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan and security agreement, maximum borrowing capacity | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ceru_BorrowingsOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Borrowings Two [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan and security agreement, maximum borrowing capacity | 5,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ceru_BorrowingsTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Borrowings Three [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan and security agreement, maximum borrowing capacity | $ 6,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ceru_BorrowingsThreeMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |

X
- Definition Amount of term loan facility required to be drawn. + References No definition available. + Details
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- Definition Class of additional warrant or right number of securities called by warrants or rights. + References No definition available. + Details
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- Definition Debt instrument additional interest rate accrue on default. + References No definition available. + Details
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- Definition Debt instrument interest rate of final payment on principal amount. + References No definition available. + Details
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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + 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)(3)) -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 3 -Article 4 + 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 Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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