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Accounts payable and accrued expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 9,312us-gaap_EmployeeRelatedLiabilitiesCurrent $ 5,103us-gaap_EmployeeRelatedLiabilitiesCurrent
Consulting and contracted research 9,349ptct_AccruedConsultingAndContractedResearchCurrent 4,006ptct_AccruedConsultingAndContractedResearchCurrent
Professional fees 3,334us-gaap_AccruedProfessionalFeesCurrent 1,294us-gaap_AccruedProfessionalFeesCurrent
Accounts payable 4,128us-gaap_AccountsPayableCurrent 1,124us-gaap_AccountsPayableCurrent
Other 2,998us-gaap_OtherAccruedLiabilitiesCurrent 680us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 29,121us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 12,207us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent