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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income (loss) per share |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents excluded from calculation of diluted earnings per share since the effect would be anti-dilutive |  |  |  |  |  |  |  |  |  |  | 600,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,300,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  | $ (17,886)us-gaap_NetIncomeLoss | $ (4,416)us-gaap_NetIncomeLoss | $ (14,587)us-gaap_NetIncomeLoss | $ (14,685)us-gaap_NetIncomeLoss | $ (93,753)us-gaap_NetIncomeLoss | $ (51,574)us-gaap_NetIncomeLoss | $ (26,235)us-gaap_NetIncomeLoss
Deemed dividend |  |  |  |  |  |  |  |  | (18,249)ptct_DeemedDividend |  | (18,249)ptct_DeemedDividend |
Gain on exchange of convertible preferred stock in connection with recapitalization | 160,000 us-gaap_PreferredStockRedemptionDiscount |  |  |  |  |  |  |  | 3,391 us-gaap_PreferredStockRedemptionDiscount |  | 3,391 us-gaap_PreferredStockRedemptionDiscount | 159,954 us-gaap_PreferredStockRedemptionDiscount
Less beneficial conversion charge |  |  |  |  |  |  |  |  |  |  |  | (378)us-gaap_PreferredStockConversionsInducements
Less net income attributable to participating preferred stock |  |  |  |  |  |  |  |  |  |  |  | (132,610)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | $ (93,753)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (66,432)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 731 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 31,565,310 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,829,411 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 3,328 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock |  |  |  |  |  |  |  |  |  |  |  | 13,877 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Denominator for diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 31,565,310 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 12,829,411 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 17,205 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic |  | $ (0.84)us-gaap_EarningsPerShareBasic | $ (0.93)us-gaap_EarningsPerShareBasic | $ (0.86)us-gaap_EarningsPerShareBasic | $ (0.58)us-gaap_EarningsPerShareBasic | $ (0.75)us-gaap_EarningsPerShareBasic | $ (0.19)us-gaap_EarningsPerShareBasic | $ (5.51)us-gaap_EarningsPerShareBasic | $ (6,527.30)us-gaap_EarningsPerShareBasic | $ (2.97)us-gaap_EarningsPerShareBasic | $ (5.18)us-gaap_EarningsPerShareBasic | $ 219.76 us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted |  | $ (0.84)us-gaap_EarningsPerShareDiluted | $ (0.93)us-gaap_EarningsPerShareDiluted | $ (0.86)us-gaap_EarningsPerShareDiluted | $ (0.58)us-gaap_EarningsPerShareDiluted | $ (0.75)us-gaap_EarningsPerShareDiluted | $ (0.19)us-gaap_EarningsPerShareDiluted | $ (5.51)us-gaap_EarningsPerShareDiluted | $ (6,527.30)us-gaap_EarningsPerShareDiluted | $ (2.97)us-gaap_EarningsPerShareDiluted | $ (5.18)us-gaap_EarningsPerShareDiluted | $ 42.50 us-gaap_EarningsPerShareDiluted

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