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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period.

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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	1,300,000
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								3,391		3,391	159,954
Less beneficial conversion charge												(378)
Less net income attributable to participating preferred stock												(132,610)
Net loss attributable to common stockholders										$ (93,753)	$ (66,432)	$ 731
Denominator
Denominator for basic earnings per share (in shares)										31,565,310	12,829,411	3,328
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock												13,877
Denominator for diluted earnings per share (in shares)										31,565,310	12,829,411	17,205
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	$ 219.76us-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	$ 42.50us-gaap_EarningsPerShareDiluted