Consolidated Entities - Theravance Respiratory Company, LLC (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 135,115						$ 135,115		$ 246,487	[1]
Receivables from collaborative arrangements	101,271						101,271		93,931	[1]
Prepaid expenses and other current assets	542						542		1,640	[1]
Equity and long-term investments	507,116						507,116		438,258	[1]
Total assets	887,239						887,239		999,570	[1]
Liabilities and LLC Members' Equity
Current liabilities	3,125						3,125		6,110	[1]
Total liabilities and stockholders' equity	887,239						887,239		999,570	[1]
Income statements
Total net revenue	97,862			$ 88,694			284,186	$ 246,318
Operating expenses	3,309			4,264			13,610	9,982
Income from operations	94,553			84,430			270,576	236,336
Other income, net	(652)			(13)			(2,036)	85
Changes in fair values of equity and long-term investments	33,613			(29,368)			133,973	39,245
Net income	102,646	$ 110,846	$ 109,695	41,621	$ 98,225	$ 78,952	323,187	218,798
Royalty revenue from a related party
Income statements
Total net revenue	97,862			88,694			284,186	236,318
Revenue from collaborative arrangements with a related party
Income statements
Total net revenue	0			0			0	10,000
Theravance Respiratory Company, LLC
Assets
Cash and cash equivalents	46,505						46,505		38,081
Receivables from collaborative arrangements	35,535						35,535		24,946
Prepaid expenses and other current assets	1						1		0
Equity and long-term investments	22,743						22,743		16,959
Total assets	104,784						104,784		79,986
Liabilities and LLC Members' Equity
Current liabilities	189						189		508
LLC members' equity	104,595						104,595		79,478
Total liabilities and stockholders' equity	104,784						104,784		$ 79,986
Income statements
Total net revenue	35,585			16,375			84,055	58,143
Operating expenses	194			607			3,811	1,358
Income from operations	35,391			15,768			80,244	56,785
Other income, net	0			0			0	37
Changes in fair values of equity and long-term investments	148			0			(589)	0
Net income	35,539			15,768			79,655	56,822
Theravance Respiratory Company, LLC | Royalty revenue from a related party
Income statements
Total net revenue	35,585			16,375			84,055	48,143
Strategic alliance - MABA program | Theravance Respiratory Company, LLC
Income statements
Total net revenue	$ 0			$ 0			$ 0	$ 10,000

[1] Consolidated balance sheet as of December 31, 2020 has been derived from audited consolidated financial statements.