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Consolidated Statement of Redeemable Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data | Total USD ($) | Series D Convertible Preferred Stock [Member] USD ($) | IPO [Member] USD ($) | Redeemable Convertible Preferred Stock [Member] USD ($) | Redeemable Convertible Preferred Stock [Member] Series D Convertible Preferred Stock [Member] USD ($) | Common Stock [Member] USD ($) | Common Stock [Member] IPO [Member] | Additional Paid-in Capital [Member] USD ($) | Additional Paid-in Capital [Member] IPO [Member] USD ($) | Accumulated Deficit [Member] USD ($)
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Redeemable convertible preferred stock, Beginning balance at Dec. 31, 2011 |  |  |  | $ 70,751 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Beginning balance at Dec. 31, 2011 | (58,397)us-gaap_StockholdersEquity |  |  |  |  |  |  | 798 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (59,195)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Redeemable convertible preferred stock, Beginning balance, shares at Dec. 31, 2011 |  |  |  | 71,374,896 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2011 |  |  |  |  |  | 609,041 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options | 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares |  |  |  |  |  | 904 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Sale of convertible preferred stock |  |  |  |  | 12,927 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |
Sale of convertible preferred stock, shares |  |  |  |  | 15,662,650 ceru_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |
Stock-based compensation | 529 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  | 529 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Accretion of issuance costs to redemption value | (73)us-gaap_TemporaryEquityAccretionToRedemptionValue |  |  | 73 us-gaap_TemporaryEquityAccretionToRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  | (73)us-gaap_TemporaryEquityAccretionToRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net loss | (22,101)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  | (22,101)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Redeemable convertible preferred stock, Ending balance at Dec. 31, 2012 |  |  |  | 83,751 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Ending balance at Dec. 31, 2012 | (80,039)us-gaap_StockholdersEquity |  |  |  |  |  |  | 1,257 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (81,296)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Redeemable convertible preferred stock, Ending balance, shares at Dec. 31, 2012 |  |  |  | 87,037,546 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2012 |  |  |  |  |  | 609,945 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options | 35 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 35 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares |  |  |  |  |  | 8,911 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation | 622 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  | 622 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of convertible preferred stock into common stock | 2,226 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities |  |  | (2,226)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  | 2,226 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of convertible preferred stock into common stock, shares |  |  |  | (1,830,190)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  | 166,675 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net loss | (17,143)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  | (17,143)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Redeemable convertible preferred stock, Ending balance at Dec. 31, 2013 | 81,525 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital | 27,521 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | 81,525 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | (94,299)us-gaap_StockholdersEquity |  |  |  |  |  |  | 4,140 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (98,439)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Redeemable convertible preferred stock, Ending balance, shares at Dec. 31, 2013 | 85,207,356 us-gaap_TemporaryEquitySharesIssued | 33,158,272 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | 85,207,356 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2013 |  |  |  |  |  | 785,531 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options | 140 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 140 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Exercise of stock options, shares | 41,566 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  | 41,566 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation | 885 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  | 885 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of Common Stock from initial public offering | 59,862 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 59,861 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of Common Stock from initial public offering, shares |  |  |  |  |  |  | 9,569,715 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |
Conversion of convertible preferred stock into common stock | 81,526 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities |  |  | (81,525)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  | 1 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 81,525 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of convertible preferred stock into common stock, shares |  |  |  | (85,207,356)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  | 6,826,004 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Reclassification of warrants |  |  | 424 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  | 424 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Conversion of convertible notes | 20,129 ceru_ConversionOfConvertibleNotes |  |  |  |  |  |  | 20,129 ceru_ConversionOfConvertibleNotes / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of convertible notes, shares |  |  |  |  |  | 2,902,233 ceru_ConversionOfConvertibleNotesShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net loss | (23,342)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  | (23,342)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending balance at Dec. 31, 2014 | $ 45,325 us-gaap_StockholdersEquity |  |  |  |  | $ 2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 167,104 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ (121,781)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending balance, shares at Dec. 31, 2014 |  |  |  |  |  | 20,125,049 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Value of accretion of temporary equity to its redemption value during the period. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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 210.5-02.27(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 28 -Subparagraph b -Article 5 + Details
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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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- Definition Carrying amount of the par value of temporary equity outstanding. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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