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Spin-Off of Theravance Biopharma, Inc. (Details) (USD $)
0 Months Ended
Jun. 02, 2014
Jun. 01, 2014
Dec. 31, 2014
Spin-Off of Theravance Biopharma, Inc.      
Cash, cash equivalents and marketable securities   $ 393,000,000thrx_ContributionOfCashAndCashEquivalentsAndMarketableSecuritiesInBusinessSeparation  
Number of shares of Theravance Biopharma issued for every share of Theravance 0.286thrx_CommonStockStockDividendRatio    
Allocation of net book value of assets transferred pursuant to spin-off      
Cash and cash equivalents 277,541,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents    
Marketable investment securities 115,129,000thrx_DisposalGroupIncludingDiscontinuedOperationAvailableForSaleSecuritiesDebtSecurities    
Accounts receivable 125,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet    
Reimbursement of certain liabilities 16,983,000thrx_ReimbursementOfCertainLiabilitiesCurrent    
Prepaid and other current assets 3,172,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssetsCurrent    
Inventories 14,328,000us-gaap_InventoriesPropertyHeldForSaleCurrent    
Fixed assets, net 9,580,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent    
Accrued liabilities (22,342,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent    
Deferred revenue (6,694,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenue    
Other liabilities (4,944,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities    
Net book value of assets contributed 402,878,000thrx_DisposalGroupIncludingDiscontinuedOperationsAssetsLiabilitiesNet    
Lease payments guarantee | Theravance Biopharma, Inc.      
Lease payment guarantee      
Other long-term liabilities     $ 1,300,000us-gaap_GuaranteesFairValueDisclosure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PropertyLeaseGuaranteeMember
/ dei_LegalEntityAxis
= thrx_TheravanceBiopharmaIncMember