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Summary of Preferred Stock Conversion Ratio (Detail)	12 Months Ended
	Dec. 31, 2014
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.094cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series A1 Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.485cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = cybr_SeriesAOnePreferredStockMember
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.000cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B1 Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.000cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = cybr_SeriesBOnePreferredStockMember	[1]
Series B2 Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.000cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = cybr_SeriesBTwoPreferredStockMember
Series B3 Preferred Stock
Class of Stock [Line Items]
Preferred Shares, Conversion Ratio	1.000cybr_PreferredStockConversionRatio / us-gaap_StatementClassOfStockAxis = cybr_SeriesBthreePreferredStockMember
[1] with respect only to the Series B1 preferred shares, serial numbers 226,503 to 257,565 (inclusive), the Conversion Price was 1.543, which results in a Conversion Ratio of 1.001451717.

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Preferred Stock Conversion Ratio

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