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Long-term debt (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended
Jul. 31, 2013
Dec. 31, 2013
Dec. 31, 2010
Sep. 30, 2009
item
Debt        
Paid outstanding principal and interest, due under promissory notes issued $ 2,600,000us-gaap_RepaymentsOfDebt      
Gains (Losses) on Extinguishment of Debt   (130,000)us-gaap_GainsLossesOnExtinguishmentOfDebt    
Secured debt facility        
Debt        
Maximum borrowing capacity       25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
Amount borrowed     $ 10,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
$ 12,500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
Number of lenders       2ptct_DebtInstrumentNumberOfLenders
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember