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Summary of Preferred Stock Conversion Ratio (Parenthetical) (Detail) (Series B1 Preferred Stock, USD $)
 12 Months Ended
Dec. 31, 2014
Class of Stock [Line Items]  
Preferred Shares, Conversion Ratio 1.000cybr_PreferredStockConversionRatio [1]
Serial numbers 226,503 to 257,565 (inclusive)  
Class of Stock [Line Items]  
Preferred Shares, Conversion price 1.543cybr_StockConversionPricePerShare
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= cybr_SerialPreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= cybr_SeriesBOnePreferredStockMember
Preferred Shares, Conversion Ratio 1.001451717cybr_PreferredStockConversionRatio
/ us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis
= cybr_SerialPreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= cybr_SeriesBOnePreferredStockMember
[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.