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Consolidated Statements of Convertible Preferred Stock and Changes in Stockholders' Equity (Deficit) (USD $)
Series A-G convertible preferred stock
Series One-Three convertible preferred stock
Series Four convertible preferred stock
Series Five convertible preferred stock
Common stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Accumulated deficit
Total
Balance at Dec. 31, 2011         $ 133us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 12,007,007us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   $ (250,611,829)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (238,604,689)us-gaap_StockholdersEquity
Balance, beginning of period at Dec. 31, 2011 214,379,914us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		                
Balance (in shares) at Dec. 31, 2011         132,122us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Balance, beginning of period (in shares) at Dec. 31, 2011 154,728,267us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		                
Increase (decrease) in temporary equity                  
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock (211,423,085)ptct_TemporaryEquityConvertedIssuedDuringPeriodValueExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		 80,823,768ptct_TemporaryEquityConvertedIssuedDuringPeriodValueExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		              
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock (in shares) (149,560,902)ptct_TemporaryEquityConvertedIssuedDuringPeriodSharesExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		 15,038,259ptct_TemporaryEquityConvertedIssuedDuringPeriodSharesExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		              
Conversion of series of convertible preferred stock to common stock (2,956,829)us-gaap_TemporaryEquityEliminationAsPartofReorganization
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		                
Conversion of series of convertible preferred stock to common stock (in shares) (5,167,365)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesAToGConvertiblePreferredStockMember		                
Increase (Decrease) in Stockholders' Equity                  
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock           159,954,069ptct_AdjustmentsToAdditionalPaidInCapitalDecreaseInCarryingAmountOfRedeemablePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     159,954,069ptct_AdjustmentsToAdditionalPaidInCapitalDecreaseInCarryingAmountOfRedeemablePreferredStock
Conversion of series of convertible preferred stock to common stock         412us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 2,956,417us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     2,956,829us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Conversion of series of convertible preferred stock to common stock (in shares)         413,223us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Beneficial conversion charge           377,787ptct_AdjustmentsToAdditionalPaidInCapitalBeneficialConversionCharge
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (377,787)ptct_AdjustmentsToAdditionalPaidInCapitalBeneficialConversionCharge
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		  
Share-based compensation expense           2,288,392us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     2,288,392us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Net loss               (26,235,102)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (26,235,000)us-gaap_NetIncomeLoss
Balance at Dec. 31, 2012         545us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 177,583,672us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   (277,224,718)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (99,640,501)us-gaap_StockholdersEquity
Balance, end of period at Dec. 31, 2012   80,823,768us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		              
Balance (in shares) at Dec. 31, 2012         545,345us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Balance, end of period (in shares) at Dec. 31, 2012   15,038,259us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		              
Increase (decrease) in temporary equity                  
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock   (80,823,768)ptct_TemporaryEquityConvertedIssuedDuringPeriodValueExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		 60,785,363ptct_TemporaryEquityConvertedIssuedDuringPeriodValueExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFourSeniorPreferredStockMember		 101,681,783ptct_TemporaryEquityConvertedIssuedDuringPeriodValueExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFiveJuniorPreferredStockMember		          
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock (in shares)   (15,038,259)ptct_TemporaryEquityConvertedIssuedDuringPeriodSharesExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesOneToThreeConvertiblePreferredStockMember		 5,374,954ptct_TemporaryEquityConvertedIssuedDuringPeriodSharesExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFourSeniorPreferredStockMember		 8,796,002ptct_TemporaryEquityConvertedIssuedDuringPeriodSharesExchangeOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFiveJuniorPreferredStockMember		          
Conversion of series of convertible preferred stock to common stock     (60,785,363)us-gaap_TemporaryEquityEliminationAsPartofReorganization
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFourSeniorPreferredStockMember		 (101,681,783)us-gaap_TemporaryEquityEliminationAsPartofReorganization
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFiveJuniorPreferredStockMember		          
Conversion of series of convertible preferred stock to common stock (in shares)     (5,374,954)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFourSeniorPreferredStockMember		 (8,796,002)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= ptct_SeriesFiveJuniorPreferredStockMember		          
Increase (Decrease) in Stockholders' Equity                  
Reverse stock split         (540,819)us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock           (14,857,927)ptct_AdjustmentsToAdditionalPaidInCapitalDecreaseInCarryingAmountOfRedeemablePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     (14,857,927)ptct_AdjustmentsToAdditionalPaidInCapitalDecreaseInCarryingAmountOfRedeemablePreferredStock
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs         9,628us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 131,640,060us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     131,649,688us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs (in shares)         9,627,800us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of series of convertible preferred stock to common stock         14,171us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 162,452,975us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     162,467,146us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Conversion of series of convertible preferred stock to common stock (in shares)         14,170,956us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Share-based compensation expense           8,427,188us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     8,427,188us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Net loss               (51,573,575)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (51,574,000)us-gaap_NetIncomeLoss
Comprehensive income (loss)             70,393us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   70,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balance at Dec. 31, 2013         24,344us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 465,245,968us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 70,393us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (328,798,293)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 136,542,000us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013         23,803,282us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Increase (Decrease) in Stockholders' Equity                  
Exercise of stock options         109us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,195,286us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,195,395us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares)         108,645us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Vesting of restricted stocks         373us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (373)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		      
Vesting of restricted stock (in shares)         373,200us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs         8,072us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 235,971,025us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     235,979,097us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs (in shares)         8,613,265us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Share-based compensation expense           19,309,652us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     19,309,652us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Net loss               (93,753,493)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (93,753,000)us-gaap_NetIncomeLoss
Comprehensive income (loss)             (807,058)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   (807,058)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balance at Dec. 31, 2014         $ 32,898us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 721,721,558us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (736,665)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (422,551,786)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 298,467,000us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014         32,898,392us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember