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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 49,748,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 15,414,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 265,493,000us-gaap_MarketableSecuritiesCurrent 127,053,000us-gaap_MarketableSecuritiesCurrent
Prepaid expenses and other current assets 3,885,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,599,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Receivables, net 4,445,000us-gaap_ReceivablesNetCurrent 958,000us-gaap_ReceivablesNetCurrent
Total current assets 323,571,000us-gaap_AssetsCurrent 145,024,000us-gaap_AssetsCurrent
Fixed assets, net 9,159,000us-gaap_PropertyPlantAndEquipmentNet 6,730,000us-gaap_PropertyPlantAndEquipmentNet
Deposits and other assets 489,000ptct_DepositsAndOtherAssetsNoncurrent 149,000ptct_DepositsAndOtherAssetsNoncurrent
Total assets 333,219,000us-gaap_Assets 151,903,000us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 29,121,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 12,207,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Current portion of long-term debt   49,000us-gaap_LongTermDebtCurrent
Deferred revenue 3,354,000us-gaap_DeferredRevenueCurrent 878,000us-gaap_DeferredRevenueCurrent
Total current liabilities 32,475,000us-gaap_LiabilitiesCurrent 13,134,000us-gaap_LiabilitiesCurrent
Other long-term liabilities 2,277,000us-gaap_OtherLiabilitiesNoncurrent 2,227,000us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 34,752,000us-gaap_Liabilities 15,361,000us-gaap_Liabilities
Stockholders' equity:    
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 32,898,392 shares at December 31, 2014. Authorized 125,000,000 shares; issued and outstanding 23,803,282 shares at December 31, 2013 33,000us-gaap_CommonStockValue 24,000us-gaap_CommonStockValue
Additional paid-in capital 721,722,000us-gaap_AdditionalPaidInCapital 465,246,000us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive (loss) income (737,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 70,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (422,551,000)us-gaap_RetainedEarningsAccumulatedDeficit (328,798,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 298,467,000us-gaap_StockholdersEquity 136,542,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 333,219,000us-gaap_LiabilitiesAndStockholdersEquity $ 151,903,000us-gaap_LiabilitiesAndStockholdersEquity