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Stock award plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2015
May 31, 2013
Mar. 05, 2013
Stock option      
Number of options      
Outstanding at the beginning of the period (in shares) 3,432,972us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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= us-gaap_StockOptionMember
   
Granted (in shares) 1,456,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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= us-gaap_StockOptionMember
   
Exercised (in shares) (234,830)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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= us-gaap_StockOptionMember
   
Forfeited (in shares) (26,265)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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= us-gaap_StockOptionMember
   
Expired (in shares) (594)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
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= us-gaap_StockOptionMember
   
Outstanding at the end of the period (in shares) 4,627,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Vested or expected to vest at the end of the period (in shares) 4,332,726us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
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Exercisable at the end of the period (in shares) 1,037,262us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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= us-gaap_StockOptionMember
   
Weighted-average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 25.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Granted (in dollars per share) $ 51.02us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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= us-gaap_StockOptionMember
   
Exercised (in dollars per share) $ 12.86us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
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= us-gaap_StockOptionMember
   
Forfeited (in dollars per share) $ 47.52us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Expired (in dollars per share) $ 389us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Outstanding at the end of the period (in dollars per share) $ 33.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Vested or expected to vest at the end of the period (in dollars per share) $ 32.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Exercisable at the end of the period (in dollars per share) $ 30.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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= us-gaap_StockOptionMember
   
Weighted-average remaining contractual term      
Outstanding at the beginning of the period 8 years 10 months 24 days    
Vested or expected to vest at the end of the period 8 years 10 months 24 days    
Exercisable at the end of the period 8 years 2 months 12 days    
Valuation assumptions      
Inducement grants for non-statutory stock options 93,350ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions
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Weighted average grant date fair value (in dollars per share) $ 31.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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= us-gaap_StockOptionMember
   
Aggregate intrinsic value      
Outstanding at the end of the period (in dollars) $ 140,399us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
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= us-gaap_StockOptionMember
   
Vested or expected to vest at the end of the period (in dollars) 133,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
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= us-gaap_StockOptionMember
   
Exercisable at the end of the period (in dollars) $ 45,137us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
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= us-gaap_StockOptionMember
   
Stock option | Minimum      
Valuation assumptions      
Risk-free interest rate (as a percent) 1.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
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Expected volatility (as a percent) 67.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
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Expected term 5 years 6 months    
Stock option | Maximum      
Valuation assumptions      
Risk-free interest rate (as a percent) 1.77%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
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Expected volatility (as a percent) 69.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
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Expected term 6 years 1 month 10 days    
2009 Equity and Long Term Incentive Plan      
Stock option plan      
Number of additional shares authorized   2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
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2013 Stock Incentive Plan      
Stock option plan      
Number of shares available for issuance     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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= ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Stock option      
Stock option plan      
Number of shares of restricted stock granted     4,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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2013 Stock Incentive Plan | Restricted stock      
Stock option plan      
Number of shares of restricted stock granted     735,324us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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= us-gaap_RestrictedStockMember
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= ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Common stock      
Stock option plan      
Number of shares authorized     739,937us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
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= ptct_StockIncentivePlan2013Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | Common stock      
Stock option plan      
Number of shares available for issuance   245,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | Common stock | Maximum      
Stock option plan      
Number of shares subject to outstanding awards   3,040,444ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards
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2013 Long Term Incentive Plan | Minimum      
Stock option plan      
Annual increase in the number of shares on the first day of the fiscal year   2,500,000ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber
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Annual increase in the number of shares outstanding on the first day of the fiscal year (as a percent)   4.00%ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding
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