Consolidated Entities - Theravance Respiratory Company, LLC (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 43,265				$ 43,265		$ 246,487	[1]
Receivables from collaborative arrangements	104,262				104,262		93,931	[1]
Prepaid expenses and other current assets	734				734		1,640	[1]
Equity and long-term investments	473,677				473,677		438,258	[1]
Total assets	789,150				789,150		999,570	[1]
Liabilities and LLC Members' Equity
Current liabilities	5,371				5,371		6,110	[1]
Total liabilities and stockholders' equity	789,150				789,150		999,570	[1]
Income statements
Total net revenue	100,806		$ 78,946		186,324	$ 157,624
Operating expenses	4,266		3,155		10,301	5,718
Income from operations	96,540		75,791		176,023	151,906
Other income, net	(951)		30		(1,384)	98
Changes in fair values of equity and long-term investments	45,315		46,698		100,360	68,613
Net income	110,846	$ 109,695	98,225	$ 78,952	220,541	177,177
Royalty revenue from a related party
Income statements
Total net revenue	100,806		68,946		186,324	147,624
Revenue from collaborative arrangements with a related party
Income statements
Total net revenue	0		10,000		0	10,000
Theravance Respiratory Company, LLC
Assets
Cash and cash equivalents	26,128				26,128		38,081
Receivables from collaborative arrangements	26,386				26,386		24,946
Prepaid expenses and other current assets	1				1		0
Equity and long-term investments	22,594				22,594		16,959
Total assets	75,109				75,109		79,986
Liabilities and LLC Members' Equity
Current liabilities	274				274		508
LLC members' equity	74,835				74,835		79,478
Total liabilities and stockholders' equity	75,109				75,109		$ 79,986
Income statements
Total net revenue	26,386		25,633		48,470	41,768
Operating expenses	336		480		3,617	751
Income from operations	26,050		25,153		44,853	41,017
Other income, net	0		1		0	37
Changes in fair values of equity and long-term investments	(254)		0		(737)	0
Net income	25,796		25,154		44,116	41,054
Theravance Respiratory Company, LLC | Royalty revenue from a related party
Income statements
Total net revenue	26,386		15,633		48,470	31,768
Strategic alliance - MABA program | Theravance Respiratory Company, LLC
Income statements
Total net revenue	$ 0		$ 10,000		$ 0	$ 10,000

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