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Long-Term Debt (Details) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
Long-Term Debt (Details) - USD ($)	Sep. 30, 2019	Nov. 30, 2018	Nov. 30, 2016	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-Term Debt
Total long-term debt					$ 455,041,000	$ 454,353,000
Long-term debt interest expense
Stated coupon interest					28,811,000	9,316,000	$ 7,475,000
Amortization of debt issuance costs					3,051,000	1,166,000	1,072,000
Total long-term debt interest expense					31,862,000	10,482,000	$ 8,547,000
9.0% non-recourse notes due 2033
Long-Term Debt
Principal amount					235,347,000	237,500,000
Unamortized debt issuance costs					$ (6,196,000)	$ (7,965,000)
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%
Notes net principal amount					$ 235,300,000
Percentage of equity interest		63.75%
9.0% non-recourse notes due 2033 \| Level 2
Long-term debt interest expense
Notes fair value					228,300,000	$ 237,500,000
3.25% Convertible Senior Notes Due 2023
Long-Term Debt
Principal amount					230,000,000	230,000,000
Unamortized debt issuance costs					$ (4,110,000)	$ (5,182,000)
Long-term debt interest expense
Proceeds from issuance of debt			$ 222,500,000
Interest rate (as a percent)			3.25%		3.25%	3.25%
Transaction costs			$ 7,500,000
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					$ 236,000,000.0	$ 235,000,000.0
Arbitration against Innoviva and TRC
Long-term debt interest expense
Amount of distribution withheld				$ 6,900,000
TRC
Long-term debt interest expense
Percentage of equity interest					85.00%
TRC \| Arbitration against Innoviva and TRC
Long-term debt interest expense
Amount of distribution withheld	$ 8,000,000.0			$ 8,000,000.0
Theravance Biopharma R&D, Inc. \| 9.0% non-recourse notes due 2033
Long-term debt interest expense
Interest rate (as a percent)		5.00%
Percentage of note to be retained		5.00%