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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 [Abstract]    
Accrued consulting and clinical trial costs $ 2,662pgnx_AccruedConsultingAndClinicalTrialCosts $ 2,672pgnx_AccruedConsultingAndClinicalTrialCosts
Accrued payroll and related costs 1,722us-gaap_EmployeeRelatedLiabilitiesCurrent 2,123us-gaap_EmployeeRelatedLiabilitiesCurrent
Legal and professional fees 1,063us-gaap_AccruedProfessionalFeesCurrent 608us-gaap_AccruedProfessionalFeesCurrent
Accounts payable and other 1,040us-gaap_AccountsPayableCurrent 793us-gaap_AccountsPayableCurrent
Other 83us-gaap_OtherAccruedLiabilitiesCurrent 316us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 6,570us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 6,512us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent