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Debt (Details) - USD ($)			1 Months Ended			12 Months Ended
Debt (Details) - USD ($)	Feb. 28, 2020	Feb. 21, 2020	Feb. 29, 2020	Nov. 30, 2018	Nov. 30, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt						$ 619,170,000	$ 455,041,000
Long-term debt interest expense
Stated coupon interest						42,625,000	28,811,000	$ 9,316,000
Interest shortfall on 2035 notes, net						17,643,000
Loss on extinguishment of debt						(15,464,000)
Amortization of deferred finance cost						1,960,000	3,051,000	$ 1,166,000
Issuer II Class C Units
Long-term debt interest expense
Percentage of economic interest		85.00%
Percentage of equity interest		75.00%
9.5% Non-Recourse 2035 Notes
Debt Instrument [Line Items]
Principal amount		$ 400,000,000.0				418,572,000
Less: 5% retained by the Company						(20,929,000)
Unamortized debt issuance costs						$ (3,847,000)
Long-term debt interest expense
Interest rate (as a percent)		9.50%				9.50%
Percentage of note to be sold		0.95%
Percentage of note to be retained		5.00%
Net principal		$ 17,600,000				$ 397,600,000
Estimated fair value						399,600,000
Unamortized debt issuance costs						3,847,000
9.0% Non-Recourse 2033 Notes
Debt Instrument [Line Items]
Principal amount							247,734,000
Less: 5% retained by the Company							(12,387,000)
Unamortized debt issuance costs						$ (1,589,000)	$ (6,196,000)
Long-term debt interest expense
Proceeds from issuance of debt				$ 250,000,000.0
Interest rate (as a percent)				9.00%		9.00%	9.00%
Loss on extinguishment of debt						$ 15,500,000
Unamortized debt issuance costs						1,589,000	$ 6,196,000
Unamortized deferred financing costs	$ 1,800,000
Creditors fees	$ 500,000			$ 4,400,000
Third party fees				$ 300,000
3.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal amount						230,000,000	230,000,000
Less: 5% retained by the Company					$ (7,500,000)
Unamortized debt issuance costs						$ (3,037,000)	$ (4,110,000)
Long-term debt interest expense
Proceeds from issuance of debt					$ 222,500,000
Interest rate (as a percent)					3.25%	3.25%	3.25%
Unamortized debt issuance costs						$ 3,037,000	$ 4,110,000
Conversion rate, in shares						29.0276
Principal amount for conversion rate						$ 1,000
Conversion price (in dollars per share)						$ 34.45
Redemption price to principal amount, in percent						100.00%
3.25% Convertible Senior Notes Due 2023 \| Level 2
Long-term debt interest expense
Notes fair value						$ 217,900,000	$ 236,000,000.0
TRC
Long-term debt interest expense
Percentage of economic interest		85.00%				85.00%
Percentage of equity interest						85.00%
TRC \| Minimum
Long-term debt interest expense
Upward tiering royalties (as a percent)		6.50%
TRC \| Maximum
Long-term debt interest expense
Upward tiering royalties (as a percent)		10.00%
TRC \| Issuer II Class C Units
Long-term debt interest expense
Percentage of economic interest		63.75%
TRC \| Arbitration against Innoviva and TRC
Long-term debt interest expense
Percentage of economic interest						0.85%
Theravance Biopharma R&D, Inc. \| 9.5% Non-Recourse 2035 Notes
Long-term debt interest expense
Interest rate (as a percent)						5.00%
Theravance Biopharma R&D, Inc. \| 9.0% Non-Recourse 2033 Notes
Long-term debt interest expense
Interest rate (as a percent)				5.00%
Redemption price to principal amount, in percent			5.00%