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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Net product revenue $ 717ptct_NetProductSales    
Collaboration revenue 22,246ptct_CollaborationRevenue 31,326ptct_CollaborationRevenue 28,779ptct_CollaborationRevenue
Grant revenue 2,282us-gaap_RevenueFromGrants 3,370us-gaap_RevenueFromGrants 5,167us-gaap_RevenueFromGrants
Total revenues 25,245us-gaap_SalesRevenueNet 34,696us-gaap_SalesRevenueNet 33,946us-gaap_SalesRevenueNet
Operating expenses:      
Research and development 79,838us-gaap_ResearchAndDevelopmentExpense 54,875us-gaap_ResearchAndDevelopmentExpense 46,139us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 44,820us-gaap_GeneralAndAdministrativeExpense 25,219us-gaap_GeneralAndAdministrativeExpense 14,615us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 124,658us-gaap_OperatingExpenses 80,094us-gaap_OperatingExpenses 60,754us-gaap_OperatingExpenses
Loss from operations (99,413)us-gaap_OperatingIncomeLoss (45,398)us-gaap_OperatingIncomeLoss (26,808)us-gaap_OperatingIncomeLoss
Interest income (expense), net 1,180us-gaap_InterestIncomeExpenseNonoperatingNet (6,084)us-gaap_InterestIncomeExpenseNonoperatingNet (1,210)us-gaap_InterestIncomeExpenseNonoperatingNet
Loss on extinguishment of debt   (130)us-gaap_GainsLossesOnExtinguishmentOfDebt  
Other income (expense), net (213)us-gaap_OtherNonoperatingIncomeExpense 38us-gaap_OtherNonoperatingIncomeExpense 1,783us-gaap_OtherNonoperatingIncomeExpense
Loss from operations before tax benefit (98,446)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (51,574)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (26,235)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net tax benefit 4,693us-gaap_IncomeTaxExpenseBenefit    
Net loss (93,753)us-gaap_NetIncomeLoss (51,574)us-gaap_NetIncomeLoss (26,235)us-gaap_NetIncomeLoss
Deemed dividend   (18,249)ptct_DeemedDividend  
Gain on exchange of convertible preferred stock in connection with recapitalization   3,391us-gaap_PreferredStockRedemptionDiscount 159,954us-gaap_PreferredStockRedemptionDiscount
Less beneficial conversion charge     (378)us-gaap_PreferredStockConversionsInducements
Net (loss) income attributable to common stockholders $ (93,753)us-gaap_ProfitLoss $ (66,432)us-gaap_ProfitLoss $ 133,341us-gaap_ProfitLoss
Net (loss) income attributable to common stockholders per share:      
Basic net income (loss) per common share $ (2.97)us-gaap_EarningsPerShareBasic $ (5.18)us-gaap_EarningsPerShareBasic $ 219.76us-gaap_EarningsPerShareBasic
Diluted net income (loss) per common share $ (2.97)us-gaap_EarningsPerShareDiluted $ (5.18)us-gaap_EarningsPerShareDiluted $ 42.50us-gaap_EarningsPerShareDiluted
Weighted-average shares outstanding:      
Basic (in shares) 31,565,310us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 12,829,411us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 3,328us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 31,565,310us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 12,829,411us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 17,205us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding