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Stockholders' Equity (Deficit) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014
Stockholders Equity Note [Abstract] |
Issuance of common stock, shares | 19,297,952 ceru_StockIssuedDuringPeriodSharesNewIssuesConversionSecuritiesAndOptionsExercised

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- Definition Stock issued during period, shares, new issues, conversion securities and options exercised. + References No definition available. + Details
Name: | ceru_StockIssuedDuringPeriodSharesNewIssuesConversionSecuritiesAndOptionsExercised
Namespace Prefix: | ceru_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration