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Summary of significant accounting policies (Details 3) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Mar. 07, 2013
Research and development costs
Deferred research and development advance payments	$ 900,000ptct_DeferredResearchAndDevelopmentCosts
Beneficial conversion
Beneficial conversion charge		378,000us-gaap_PreferredStockConversionsInducements
Impairment of long-lived assets
Impairment of long-lived assets	0us-gaap_AssetImpairmentCharges
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Net tax benefit	4,693,000us-gaap_IncomeTaxExpenseBenefit
New Jersey
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Net tax benefit	$ 4,900,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = stpr_NJ
Common stock
Reverse Stock Split [Abstract]
Reverse stock split ratio			0.0083us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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Represents the carrying amount of deferred research and development costs.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-SubTopic 10

-Section S99

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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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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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