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Income taxes (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Credit carryforwards
Orphan drug credit carryover	$ 11.4us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Limited NOL carryforwards	231.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Operating loss carryforwards, not subject to expiration	169.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
NOL carryforward period	20 years
Operating loss carryforwards, subject to expiration	62.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
Operating loss carryforwards for immediate use	82.1ptct_OperatingLossCarryforwardsForImmediateUse
Operating loss carryforwards in next twelve months	16.7ptct_OperatingLossCarryforwardsInNextTwelveMonths
Federal
Credit carryforwards
Credit carryforwards	6.5us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Net operating loss carryforwards	226.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
State
Credit carryforwards
Credit carryforwards	1.7us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Net operating loss carryforwards	154.6us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
First five years from ownership change
Credit carryforwards
Net operating loss carryforwards	16.7us-gaap_OperatingLossCarryforwards / us-gaap_TaxPeriodAxis = ptct_FirstFiveYearsMember
After five years
Credit carryforwards
Net operating loss carryforwards	$ 5.7us-gaap_OperatingLossCarryforwards / us-gaap_TaxPeriodAxis = ptct_ThereAfterFiveYearsMember

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Represents the operating loss carryforwards for immediate use.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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