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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 36,825us-gaap_CashAndCashEquivalentsAtCarryingValue $ 49,748us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 243,642us-gaap_MarketableSecuritiesCurrent 265,493us-gaap_MarketableSecuritiesCurrent
Prepaid expenses and other current assets 6,116us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,885us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Receivables, net 3,178us-gaap_ReceivablesNetCurrent 4,445us-gaap_ReceivablesNetCurrent
Total current assets 289,761us-gaap_AssetsCurrent 323,571us-gaap_AssetsCurrent
Fixed assets, net 9,408us-gaap_PropertyPlantAndEquipmentNet 9,159us-gaap_PropertyPlantAndEquipmentNet
Deposits and other assets 351ptct_DepositsAndOtherAssetsNoncurrent 489ptct_DepositsAndOtherAssetsNoncurrent
Total assets 299,520us-gaap_Assets 333,219us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 23,532us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 29,121us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Deferred revenue 373us-gaap_DeferredRevenueCurrent 3,354us-gaap_DeferredRevenueCurrent
Total current liabilities 23,905us-gaap_LiabilitiesCurrent 32,475us-gaap_LiabilitiesCurrent
Other long-term liabilities 2,295us-gaap_OtherLiabilitiesNoncurrent 2,277us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 26,200us-gaap_Liabilities 34,752us-gaap_Liabilities
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 33,483,306 shares at March 31, 2015. Authorized 125,000,000 shares; issued and outstanding 32,898,392 shares at December 31, 2014 33us-gaap_CommonStockValue 33us-gaap_CommonStockValue
Additional paid-in capital 734,489us-gaap_AdditionalPaidInCapital 721,722us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss (736)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (737)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (460,466)us-gaap_RetainedEarningsAccumulatedDeficit (422,551)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 273,320us-gaap_StockholdersEquity 298,467us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 299,520us-gaap_LiabilitiesAndStockholdersEquity $ 333,219us-gaap_LiabilitiesAndStockholdersEquity