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Accounts payable and accrued expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts payable and accrued expenses    
Employee compensation, benefits, and related accruals $ 3,365us-gaap_EmployeeRelatedLiabilitiesCurrent $ 9,312us-gaap_EmployeeRelatedLiabilitiesCurrent
Consulting and contracted research 11,691ptct_AccruedConsultingAndContractedResearchCurrent 9,349ptct_AccruedConsultingAndContractedResearchCurrent
Professional fees 3,382us-gaap_AccruedProfessionalFeesCurrent 3,334us-gaap_AccruedProfessionalFeesCurrent
Accounts payable 3,139us-gaap_AccountsPayableCurrent 4,128us-gaap_AccountsPayableCurrent
Other 1,955us-gaap_OtherAccruedLiabilitiesCurrent 2,998us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 23,532us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 29,121us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent