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v2.4.1.9

Capital structure (Details 2) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2012 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 07, 2013 | May 31, 2013 | Oct. 16, 2014 | Feb. 28, 2014 | Jun. 30, 2013 | Feb. 28, 2013
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds |  |  |  |  |  | $ 29,355,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock |  |  |  |  |  |
Gross proceeds raised |  | 60,000,000 ptct_ProceedsFromIssuanceOfConvertiblePreferredStockAndShortTermDebt |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of shares of Series One, Two and Three stock | 160,000,000 us-gaap_PreferredStockRedemptionDiscount |  | 3,391,000 us-gaap_PreferredStockRedemptionDiscount |  | 3,391,000 us-gaap_PreferredStockRedemptionDiscount | 159,954,000 us-gaap_PreferredStockRedemptionDiscount |  |  |  |  |  |
Aggregate purchase price |  |  |  | 235,979,097 us-gaap_StockIssuedDuringPeriodValueNewIssues | 131,649,688 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized shares |  |  |  | 125,000,000 us-gaap_CommonStockSharesAuthorized | 125,000,000 us-gaap_CommonStockSharesAuthorized |  |  | 125,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |
Series One and Series Two | Warrant |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase shares |  |  |  |  |  |  |  |  |  |  |  | 2,527,675 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesOneAndTwoConvertiblePreferredStockMember
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesOneAndTwoConvertiblePreferredStockMember
Shares issued and sold |  |  |  |  |  |  | 2,527,675 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesOneAndTwoConvertiblePreferredStockMember |  |  |  |  |
Series Four convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Shares issued and sold |  |  |  |  |  |  | 4,497,035 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember | 375,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember |  |  |  |
Aggregate gross proceeds |  |  |  |  |  |  | 54,000,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  | $ 12.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  | 4,500,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember |  |  |  |
Series Five convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  | 6,700,487 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = ptct_SeriesFiveJuniorPreferredStockMember |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  | 6,700,487 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = ptct_SeriesFiveJuniorPreferredStockMember |  |  |  |  |
Series Five convertible preferred stock | Warrant |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  | 2,095,515 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesFiveJuniorPreferredStockMember |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  | 2,095,515 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesFiveJuniorPreferredStockMember |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Shares issued and sold |  |  |  |  |  |  |  |  | 3,450,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 5,163,265 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 9,627,800 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Reverse stock split ratio |  |  |  |  |  |  | 0.0083 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 15.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Public offering price (in dollars per share) |  |  |  |  |  |  |  |  | $ 36.25 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 24.50 us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issuable pursuant to the exercise by the underwriters of an over-allotment option |  |  |  |  |  |  |  |  | 450,000 ptct_StockIssuablePursuantToUnderwriterAgreementOverallotmentOption / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 673,469 ptct_StockIssuablePursuantToUnderwriterAgreementOverallotmentOption / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 1,255,800 ptct_StockIssuablePursuantToUnderwriterAgreementOverallotmentOption / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Net proceeds from public offerings |  |  |  |  |  |  |  |  | 117,600,000 ptct_ProceedsFromIssuancePublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 118,400,000 ptct_ProceedsFromIssuancePublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Net proceeds from initial public offering |  |  |  |  |  |  |  |  |  |  | 131,600,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Series Four and Series Five Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  |  |  |  |  | 14,170,956 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourAndFiveConvertiblePreferredStockMember |
Number of shares issuable upon conversion of each stock |  |  |  |  |  |  |  |  |  |  | 1 ptct_ConvertiblePreferredStockSharesIssuedUponConversionEachStock / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourAndFiveConvertiblePreferredStockMember |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  |  |  |  |  |  |  | 14,170,956 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourAndFiveConvertiblePreferredStockMember |
Convertible promissory notes |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of convertible promissory notes issued |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ptct_ConvertiblePromissoryNoteMember
Debt discount recorded to interest expense |  | 6,000,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = ptct_ConvertiblePromissoryNoteMember |  |  |  |  |  |  |  |  |  |
Amount raised in bridge financing |  | $ 6,000,000 us-gaap_ProceedsFromShortTermDebt / us-gaap_DebtInstrumentAxis = ptct_ConvertiblePromissoryNoteMember |  |  |  |  |  |  |  |  |  |
Convertible promissory notes | Series Four convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion of convertible promissory notes |  |  |  |  |  |  | 502,919 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = ptct_ConvertiblePromissoryNoteMember / us-gaap_StatementClassOfStockAxis = ptct_SeriesFourSeniorPreferredStockMember |  |  |  |  |

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