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Income taxes (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating loss carryforwards
Net tax benefit	$ 4,693,000us-gaap_IncomeTaxExpenseBenefit
Uncertain tax position	0us-gaap_LiabilityForUncertainTaxPositionsCurrent	0us-gaap_LiabilityForUncertainTaxPositionsCurrent
U.S. federal income tax rate (as a percent)	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
New Jersey
Operating loss carryforwards
Net tax benefit	4,900,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = stpr_NJ
State | New Jersey
Operating loss carryforwards
Net operating loss carryforwards sold under the Technology Business Tax Certificate Transfer Program	$ 50,400,000ptct_OperatingLossCarryforwardsSoldUnderTransferProgram / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_NJ

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Represents the operating loss carryforwards sold under the Technology Business Tax Certificate Transfer Program.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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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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-Publisher FASB

-Name Accounting Standards Codification

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The current portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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