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Stock option plan (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
Mar. 05, 2013
Weighted-average remaining contractual term            
Outstanding at the end of the period 5 years 8 months 27 days          
Stock option            
Number of options            
Outstanding at the beginning of the period (in shares)   2,095,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
42,394us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
46,794us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Granted (in shares)   1,639,996us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2,117,113us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
5,715us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Exercised (in shares)   (108,645)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Forfeited (in shares)   (193,971)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
(63,915)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
(10,115)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Outstanding at the end of the period (in shares)   3,432,972us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
2,095,592us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
42,394us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Vested or expected to vest at the end of the period (in shares)   3,239,515us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Exercisable at the end of the period (in shares)   764,277us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Exercise price            
Granted (in dollars per share)       $ 218.40ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Weighted-average exercise price            
Outstanding at the beginning of the period (in dollars per share)   $ 20.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 474.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 532.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Granted (in dollars per share)   $ 31.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 11.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 218.40us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Exercised (in dollars per share)   $ 11.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Forfeited (in dollars per share)   $ 32.91us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 12.57us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 604.80us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Outstanding at the end of the period (in dollars per share)   $ 25.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 20.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 474.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Vested or expected to vest at the end of the period (in dollars per share)   $ 24.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Exercisable at the end of the period (in dollars per share)   $ 31.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Weighted-average remaining contractual term            
Outstanding at the end of the period   8 years 9 months 7 days 9 years 3 months 15 days 5 years 7 days    
Vested or expected to vest at the end of the period   8 years 9 months 11 days        
Exercisable at the end of the period   8 years 2 months 27 days        
Valuation assumptions            
Risk-free interest rate (as a percent)       1.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Expected volatility (as a percent)       87.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Expected dividend yield (as a percent)   0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Weighted average grant date fair value (in dollars per share)   $ 22.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 8.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 160.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
   
Aggregate intrinsic value            
Outstanding at the end of the period (in dollars)   $ 106,796us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Vested or expected to vest at the end of the period (in dollars)   101,391us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Exercisable at the end of the period (in dollars)   $ 29,809us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
       
Stock option | Minimum            
Stock option plan            
Vesting period   3 years        
Exercise price            
Outstanding at the beginning of the period (in dollars per share)   $ 10.59ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 218.40ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 226.80ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Granted (in dollars per share)   $ 18.78ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 10.59ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Exercised (in dollars per share)   $ 10.85ptct_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisedInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Forfeited (in dollars per share)   $ 10.85ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 10.85ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 218.40ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Outstanding at the end of the period (in dollars per share)   $ 10.59ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 10.59ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 218.40ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Valuation assumptions            
Risk-free interest rate (as a percent)   0.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Expected volatility (as a percent)   70.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
87.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Expected term   5 years 6 months 6 years 6 years    
Stock option | Maximum            
Stock option plan            
Vesting period   4 years        
Exercise price            
Outstanding at the beginning of the period (in dollars per share)   $ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Granted (in dollars per share)   $ 50.45ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 20.76ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Exercised (in dollars per share)   $ 20.71ptct_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisedInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Forfeited (in dollars per share)   $ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Outstanding at the end of the period (in dollars per share)   $ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1,149.60ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Valuation assumptions            
Risk-free interest rate (as a percent)   2.04%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Expected volatility (as a percent)   91.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
89.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Expected term   6 years 3 months 6 years 3 months 6 years 3 months    
2009 Equity and Long-Term Incentive Plan            
Stock option plan            
Number of shares available for issuance         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ptct_EquityAndLongTermIncentivePlan2009Member
 
Number of additional shares authorized         2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ptct_EquityAndLongTermIncentivePlan2009Member
 
2009 Equity and Long-Term Incentive Plan | Stock option | Minimum            
Stock option plan            
Stock options granted, exercise price as percentage of the fair market value of common stock at grant date   100.00%ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedExercisePriceAsPercentageOfFairMarketValueOfCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_EquityAndLongTermIncentivePlan2009Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Stock options granted to stockholder with specified ownership percentage, exercise price as percentage of the fair market value of common stock at grant date   110.00%ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedToStockholdersWithSpecifiedOwnershipPercentageExercisePriceAsPercentageOfFairMarketValueOfCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_EquityAndLongTermIncentivePlan2009Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Stockholder's specified ownership percentage   10.00%ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockholdersSpecifiedOwnershipPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_EquityAndLongTermIncentivePlan2009Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
2009 Equity and Long-Term Incentive Plan | Stock option | Maximum            
Stock option plan            
Expiration period   10 years        
2013 Stock Incentive Plan            
Stock option plan            
Number of shares available for issuance           0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Stock option            
Stock option plan            
Number of shares of restricted stock granted           4,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Restricted stock            
Stock option plan            
Number of shares of restricted stock granted           735,324us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Common stock            
Stock option plan            
Number of shares authorized           739,937us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= 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         262,044us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
2013 Long Term Incentive Plan | Common stock            
Stock option plan            
Number of shares available for issuance   255,463us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ptct_LongTermIncentivePlan2013Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
2013 Long Term Incentive Plan | Common stock | Minimum            
Stock option plan            
Annual increase in the number of shares on the first day of the fiscal year         2,500,000ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber
/ us-gaap_PlanNameAxis
= ptct_LongTermIncentivePlan2013Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
Annual increase in the number of shares outstanding on the first day of the fiscal year (as a percent)         4.00%ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding
/ us-gaap_PlanNameAxis
= ptct_LongTermIncentivePlan2013Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
2013 Long Term Incentive Plan | Common stock | Maximum            
Stock option plan            
Number of shares subject to outstanding awards         3,040,444ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards
/ us-gaap_PlanNameAxis
= ptct_LongTermIncentivePlan2013Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
Inducement grant plan | Stock option            
Number of options            
Granted (in shares)   595,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_InducementGrantPlanMember
       
Forfeited (in shares)   (5,900)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_InducementGrantPlanMember
       
Exercise price            
Granted (in dollars per share)   $ 37.15ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ptct_InducementGrantPlanMember