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Description of Operations and Summary of Significant Accounting Policies (Details 5) (USD $)
1 Months Ended 7 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 30, 2014
Product Revenues            
Revenue from product sales   $ 0us-gaap_SalesRevenueGoodsNet        
Revenue recognition            
Allowance for doubtful accounts       0us-gaap_AllowanceForDoubtfulAccountsReceivable    
Other Income (Expense), net            
Termination fee received as other income 10,000,000us-gaap_OtherNonoperatingIncome          
Other-than-temporary impairment loss     3,752,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities  
Theravance Biopharma, Inc.            
Other Income (Expense), net            
Other-than-temporary impairment loss     3,752,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
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GSK | 9% fixed rate term notes due 2029            
Product Revenues            
Loan amount           450,000,000us-gaap_DebtInstrumentFaceAmount
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Interest rate (as a percent)           9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Reserve account for covering remaining milestone payments as a percentage of future milestone payments           40.00%thrx_ReserveAccountForCoveringRemainingMilestonePaymentsAsPercentageOfFutureMilestonePayments
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Transaction costs           $ 15,300,000us-gaap_UnamortizedDebtIssuanceExpense
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