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Capital Stock - Additional Information (Detail) (USD $)
9 Months Ended 0 Months Ended
Sep. 30, 2014
Payment
Nov. 18, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Common stock, shares authorized 10,000,000us-gaap_CommonStockSharesAuthorized   10,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued 535,685us-gaap_CommonStockSharesIssued   535,685us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 535,685us-gaap_CommonStockSharesOutstanding   535,685us-gaap_CommonStockSharesOutstanding
Common stock, vote description Each share of common stock is entitled to one vote. The holders of common stock are also entitled to receive dividends whenever funds are legally available and when and if declared by the Board of Directors, subject to the prior rights of all classes of stock outstanding. The holders of common stock, voting as a separate class, are entitled to elect one member of the Board of Directors.    
Convertible preferred stock, shares authorized 1,860,000us-gaap_TemporaryEquitySharesAuthorized    
Minimum shares outstanding for voting rights 1,000,000capn_MinimumSharesOutstandingForVotingRights    
Voting rights description The holders of each share of Series A, Series B and Series C would have been entitled to voting rights equal to the number of shares of common stock into which each share of preferred stock would have been converted. So long as at least 1,000,000 shares are outstanding, the holders of Series A, Series B and Series C, voting together as a single class, would have been entitled to elect three members of the Board of Directors. The holders of common stock, voting as a separate class, would have been entitled to elect one member of the Board of Directors. The holders of Series A, Series B, Series C and common stock, voting together as a single class on an as converted basis, would have been entitled to elect the remaining members of the Board of Directors.    
Dividends declared or paid amount $ 0us-gaap_DividendsPayableCurrentAndNoncurrent    
Conversion of stock, description Each share of Series A, Series B and Series C would have been convertible to common stock, at the option of the holder, at any time after the date of issuance. Each share of Series A, Series B and Series C converts into that number of shares of common stock determined in accordance with the conversion ratio (i) immediately prior to the closing of a public offering of common stock provided that the offering price per share is not less than $75.60 (adjusted for recapitalizations) and gross proceeds to the Company are not less than $30,000,000 or (ii) upon the written request by the Company from the holders of two thirds of the preferred stock outstanding.    
Convertible preferred stock conversion terms, common stock offering minimum price per share $ 75.60capn_ConvertiblePreferredStockConversionTermsCommonStockOfferingMinimumPricePerShare    
Convertible preferred stock, conversion terms, common stock offering minimum gross proceeds. 30,000,000capn_ConvertiblePreferredStockConversionTermsCommonStockOfferingMinimumGrossProceeds    
Common stock conversion basis The initial conversion ratio would have been one share of common stock for each share of preferred stock.    
Convertible preferred stock, earliest redemption date Mar. 20, 2012    
Convertible preferred stock, number of annual payments 2capn_NumberOfPaymentsToRedeemConvertiblePreferredStock    
Convertible preferred stock, redemption price $ 23,808,048us-gaap_TemporaryEquityAggregateAmountOfRedemptionRequirement   $ 23,808,048us-gaap_TemporaryEquityAggregateAmountOfRedemptionRequirement
Common stock [Member] | Subsequent event [Member] | IPO [Member]      
Class of Stock [Line Items]      
Common stock issued upon conversion of convertible preferred stock   865,429us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
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/ us-gaap_SubsequentEventTypeAxis
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= us-gaap_IPOMember
 
Convertible preferred stock [Member]      
Class of Stock [Line Items]      
Convertible preferred stock, shares authorized 1,860,000us-gaap_TemporaryEquitySharesAuthorized
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  1,860,000us-gaap_TemporaryEquitySharesAuthorized
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Series A convertible preferred stock [Member]      
Class of Stock [Line Items]      
Convertible preferred stock, shares authorized 40,000us-gaap_TemporaryEquitySharesAuthorized
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  40,000us-gaap_TemporaryEquitySharesAuthorized
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Non-cumulative dividends rate $ 3.84us-gaap_PreferredStockDividendRatePerDollarAmount
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Conversion price per share $ 48.00us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
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  $ 48.00us-gaap_TemporaryEquityRedemptionPricePerShare
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= us-gaap_SeriesAPreferredStockMember
Liquidation amount per share $ 48.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
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Series B convertible preferred stock [Member]      
Class of Stock [Line Items]      
Convertible preferred stock, shares authorized 320,000us-gaap_TemporaryEquitySharesAuthorized
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  320,000us-gaap_TemporaryEquitySharesAuthorized
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Non-cumulative dividends rate $ 4.61us-gaap_PreferredStockDividendRatePerDollarAmount
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Conversion price per share $ 57.60us-gaap_TemporaryEquityRedemptionPricePerShare
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  $ 57.60us-gaap_TemporaryEquityRedemptionPricePerShare
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= us-gaap_SeriesBPreferredStockMember
Liquidation amount per share $ 57.60us-gaap_TemporaryEquityLiquidationPreferencePerShare
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Series C convertible preferred stock [Member]      
Class of Stock [Line Items]      
Convertible preferred stock, shares authorized 1,500,000us-gaap_TemporaryEquitySharesAuthorized
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  1,500,000us-gaap_TemporaryEquitySharesAuthorized
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Non-cumulative dividends rate $ 1.73us-gaap_PreferredStockDividendRatePerDollarAmount
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Conversion price per share $ 21.60us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
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  $ 21.60us-gaap_TemporaryEquityRedemptionPricePerShare
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= us-gaap_SeriesCPreferredStockMember
Liquidation amount per share $ 21.60us-gaap_TemporaryEquityLiquidationPreferencePerShare
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