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Capital structure (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2012
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Capital structure          
Par value (in dollars per share)         0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
Number of members of board of directors who can be elected by holders of the preferred stock, voting as a single class         6ptct_NumberOfMembersOfBoardOfDirectorsWhoCanBeElectedByHoldersOfPreferredStockVotingAsSingleClass
Proceeds from Issuance of Convertible Preferred Stock       $ 29,355,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock  
Preferred Stock Redemption Discount 160,000,000us-gaap_PreferredStockRedemptionDiscount 3,391,000us-gaap_PreferredStockRedemptionDiscount 3,391,000us-gaap_PreferredStockRedemptionDiscount 159,954,000us-gaap_PreferredStockRedemptionDiscount  
Maximum          
Capital structure          
Shares authorized         156,995,095us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum          
Capital structure          
Percentage of the outstanding preferred shares on an as-converted to common stock basis         66.67%ptct_TemporaryEquityPercentageOfOutstandingConvertiblePreferredSharesForAutomaticConversionCondition
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Series A          
Capital structure          
Shares authorized         750,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Conversion factor         0.0833ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Liquidation preference (in dollars per share)         1.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Aggregate liquidation preference         750,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B          
Capital structure          
Shares authorized         187,500us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Conversion factor         0.1333ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Liquidation preference (in dollars per share)         2.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Aggregate liquidation preference         375,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series C          
Capital structure          
Shares authorized         6,295,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Conversion factor         0.1389ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Liquidation preference (in dollars per share)         2.50us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Aggregate liquidation preference         15,000,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Series D          
Capital structure          
Shares authorized         13,769,935us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Conversion factor         0.1548ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Liquidation preference (in dollars per share)         3.25us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Aggregate liquidation preference         42,561,249us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Series E          
Capital structure          
Shares authorized         126,735,022us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Conversion factor         0.0548ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Liquidation preference (in dollars per share)         0.397644us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Aggregate liquidation preference         49,999,998us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Series E-2          
Capital structure          
Shares authorized         3,670,138us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesE2ConvertiblePreferredStockMember
Conversion factor         1.0000ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesE2ConvertiblePreferredStockMember
Liquidation preference (in dollars per share)         7.26us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesE2ConvertiblePreferredStockMember
Aggregate liquidation preference         26,645,187us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesE2ConvertiblePreferredStockMember
Series F          
Capital structure          
Shares authorized         675,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
Conversion factor         1.0000ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
Liquidation preference (in dollars per share)         16.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
Aggregate liquidation preference         10,000,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesFPreferredStockMember
Series F-2 convertible preferred stock          
Capital structure          
Shares authorized         1,612,500us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesF2ConvertiblePreferredStockMember
Conversion factor         1.0000ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesF2ConvertiblePreferredStockMember
Liquidation preference (in dollars per share)         16.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesF2ConvertiblePreferredStockMember
Aggregate liquidation preference         24,248,048us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesF2ConvertiblePreferredStockMember
Series G          
Capital structure          
Shares authorized         3,300,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
Conversion factor         1.0000ptct_ConvertiblePreferredStockConversionFactor
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
Liquidation preference (in dollars per share)         16.00us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
Aggregate liquidation preference         50,300,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
Series F, F-2 and G | Minimum          
Capital structure          
Percentage of the outstanding preferred shares on an as-converted to common stock basis         66.67%ptct_TemporaryEquityPercentageOfOutstandingConvertiblePreferredSharesForAutomaticConversionCondition
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFF2AndGConvertiblePreferredStockMember
Series One convertible preferred stock          
Capital structure          
Number of members of board of directors who can be elected by holders of the preferred stock, voting as a single class       12ptct_NumberOfMembersOfBoardOfDirectorsWhoCanBeElectedByHoldersOfPreferredStockVotingAsSingleClass
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Stock Issued During Period, Shares, New Issues       1,483,337us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Proceeds from Issuance of Convertible Preferred Stock       $ 29,700,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Original issuance price multiplier       2ptct_TemporaryEquityLiquidationPreferenceOriginalIssuancePriceMultiplier
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Assets available for distribution to series convertible preferred stock, distribution percentage       23.53%ptct_TemporaryEquityLiquidationPreferenceAssetsAvailableForDistributionToSeriesTwoConvertiblePreferredStockDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Assets available for distribution to series convertible preferred stock, distribution percentage.       23.53%ptct_TemporaryEquityLiquidationPreferenceAssetsAvailableForDistributionToSeriesThreeConvertiblePreferredStockDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Remaining assets distribution percentage       20.00%ptct_TemporaryEquityLiquidationPreferenceRemainingAssetsDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Shares issued upon conversion of preferred stock multiplier       5ptct_TemporaryEquitySharesIssuedUponConversionMultiplier
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Convertible Preferred Stock, Shares Issued upon Conversion       2us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneConvertiblePreferredStockMember
 
Series Two convertible preferred stock          
Capital structure          
Assets available for distribution to series convertible preferred stock, distribution percentage       76.47%ptct_TemporaryEquityLiquidationPreferenceAssetsAvailableForDistributionToSeriesTwoConvertiblePreferredStockDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesTwoConvertiblePreferredStockMember
 
Stated liquidation preference amount multiplier       1ptct_TemporaryEquityLiquidationPreferenceStatedLiquidationPreferenceAmountMultiplier
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesTwoConvertiblePreferredStockMember
 
Assets available for distribution to series convertible preferred stock, distribution percentage.       67.65%ptct_TemporaryEquityLiquidationPreferenceAssetsAvailableForDistributionToSeriesThreeConvertiblePreferredStockDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesTwoConvertiblePreferredStockMember
 
Remaining assets distribution percentage       55.00%ptct_TemporaryEquityLiquidationPreferenceRemainingAssetsDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesTwoConvertiblePreferredStockMember
 
Convertible Preferred Stock, Shares Issued upon Conversion       1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesTwoConvertiblePreferredStockMember
 
Series Three convertible preferred stock          
Capital structure          
Stated liquidation preference amount multiplier       1ptct_TemporaryEquityLiquidationPreferenceStatedLiquidationPreferenceAmountMultiplier
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesThreeConvertiblePreferredStockMember
 
Assets available for distribution to series convertible preferred stock, distribution percentage.       8.82%ptct_TemporaryEquityLiquidationPreferenceAssetsAvailableForDistributionToSeriesThreeConvertiblePreferredStockDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesThreeConvertiblePreferredStockMember
 
Remaining assets distribution percentage       25.00%ptct_TemporaryEquityLiquidationPreferenceRemainingAssetsDistributionPercentage
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesThreeConvertiblePreferredStockMember
 
Convertible Preferred Stock, Shares Issued upon Conversion       1us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesThreeConvertiblePreferredStockMember