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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) |  | 2,095,592 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 42,394 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 46,794 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Granted (in shares) |  | 1,639,996 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2,117,113 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 5,715 us-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) |  | 3,432,972 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2,095,592 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 42,394 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Vested or expected to vest at the end of the period (in shares) |  | 3,239,515 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Exercisable at the end of the period (in shares) |  | 764,277 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Exercise price |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 218.40 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Weighted-average exercise price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 20.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 474.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 532.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Granted (in dollars per share) |  | $ 31.09 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 11.29 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 218.40 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Exercised (in dollars per share) |  | $ 11.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Forfeited (in dollars per share) |  | $ 32.91 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 12.57 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 604.80 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Outstanding at the end of the period (in dollars per share) |  | $ 25.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 20.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 474.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Vested or expected to vest at the end of the period (in dollars per share) |  | $ 24.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Exercisable at the end of the period (in dollars per share) |  | $ 31.84 us-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) |  | $ 22.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 8.23 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | $ 160.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Aggregate intrinsic value |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  | $ 106,796 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Vested or expected to vest at the end of the period (in dollars) |  | 101,391 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |  |  |
Exercisable at the end of the period (in dollars) |  | $ 29,809 us-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) |  | $ 10.59 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 218.40 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 226.80 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Granted (in dollars per share) |  | $ 18.78 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 10.59 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Exercised (in dollars per share) |  | $ 10.85 ptct_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisedInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Forfeited (in dollars per share) |  | $ 10.85 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 10.85 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 218.40 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Outstanding at the end of the period (in dollars per share) |  | $ 10.59 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 10.59 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 218.40 ptct_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) |  | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Granted (in dollars per share) |  | $ 50.45 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 20.76 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Exercised (in dollars per share) |  | $ 20.71 ptct_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisedInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Forfeited (in dollars per share) |  | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Outstanding at the end of the period (in dollars per share) |  | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,149.60 ptct_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 |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ptct_EquityAndLongTermIncentivePlan2009Member |
Number of additional shares authorized |  |  |  |  | 2,500,000 us-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 |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ptct_StockIncentivePlan2013Member
2013 Stock Incentive Plan | Stock option |  |  |  |  |  |
Stock option plan |  |  |  |  |  |
Number of shares of restricted stock granted |  |  |  |  |  | 4,613 us-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 |  |  |  |  |  | 735,324 us-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 |  |  |  |  |  | 739,937 us-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 |  |  |  |  | 262,044 us-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 |  | 255,463 us-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 |  |  |  |  | 2,500,000 ptct_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 |  |  |  |  | 3,040,444 ptct_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) |  | 595,300 us-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) |  | $ 37.15 ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember / us-gaap_PlanNameAxis = ptct_InducementGrantPlanMember |  |  |  |

X
- Definition Represents the percentage of shares outstanding to be added annually on the first day of each fiscal year in the number of shares authorized. + References No definition available. + Details
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- Definition Represents the number of shares to be added annually on the first day of each fiscal year in the number of shares authorized. + References No definition available. + Details
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- Definition Represents the exercise price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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