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Redeemable Convertible Preferred Stock - Schedule of Preferred Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Temporary Equity [Line Items] |
Preferred Shares Authorized | 88,894,772 us-gaap_TemporaryEquitySharesAuthorized
Preferred Shares Issued | 85,207,356 us-gaap_TemporaryEquitySharesIssued
Preferred Shares Outstanding | 85,207,356 us-gaap_TemporaryEquitySharesOutstanding
Redemption Value /Liquidation Preference | $ 81,990 us-gaap_TemporaryEquityLiquidationPreference
Carrying Value | 81,525 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Seed Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 2,500,000 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = ceru_SeedPreferredStockMember
Issuance Date | 2006-12
Preferred Shares Issued | 2,500,000 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = ceru_SeedPreferredStockMember
Preferred Shares Outstanding | 2,500,000 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = ceru_SeedPreferredStockMember
Redemption Value /Liquidation Preference | 2,000 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = ceru_SeedPreferredStockMember
Carrying Value | 2,000 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = ceru_SeedPreferredStockMember
Series A Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 9,307,692 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Issuance Date | 2007-05
Preferred Shares Issued | 9,307,692 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred Shares Outstanding | 9,307,692 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Redemption Value /Liquidation Preference | 12,100 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Carrying Value | 12,100 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 4,077,500 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Issuance Date | 2007-12
Preferred Shares Issued | 3,562,500 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred Shares Outstanding | 3,562,500 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Redemption Value /Liquidation Preference | 7,125 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Carrying Value | 7,125 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B-1 Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 5,000,000 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = ceru_SeriesBOnePreferredStockMember
Issuance Date | 2009-07
Preferred Shares Issued | 4,842,500 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = ceru_SeriesBOnePreferredStockMember
Preferred Shares Outstanding | 4,842,500 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = ceru_SeriesBOnePreferredStockMember
Redemption Value /Liquidation Preference | 9,685 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = ceru_SeriesBOnePreferredStockMember
Carrying Value | 9,685 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = ceru_SeriesBOnePreferredStockMember
Series C Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 33,310,787 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Issuance Date | November 2010 and June 2011
Preferred Shares Issued | 31,836,392 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Preferred Shares Outstanding | 31,836,392 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Redemption Value /Liquidation Preference | 23,559 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Carrying Value | 23,094 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series D Convertible Preferred Stock [Member] |
Temporary Equity [Line Items] |
Preferred Shares Authorized | 34,698,793 us-gaap_TemporaryEquitySharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Issuance Date | December 2011 and November 2012
Preferred Shares Issued | 33,158,272 us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Preferred Shares Outstanding | 33,158,272 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Redemption Value /Liquidation Preference | 27,521 us-gaap_TemporaryEquityLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Carrying Value | $ 27,521 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember

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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. 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 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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 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 The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus 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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