CONSOLIDATED ENTITIES - Theravance Respiratory Company, LLC (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 246,487	$ 278,096
Receivables from collaborative arrangements	93,931	79,427
Prepaid expenses and other current assets	1,640	962
Equity and other long-term investments	438,258	0
Total assets	999,570	724,826
Liabilities and LLC Members' Equity
Current liabilities	6,110	5,371
LLC members' equity	539,912	313,495
Total liabilities and stockholders' equity	999,570	724,826
Income statements of TRC
Total net revenue	336,794	261,016	$ 261,004
Operating expenses	15,671	14,656	22,753
Income from operations	321,123	246,360	238,251
Other income (expense), net	(348)	(345)	(5,702)
Changes in fair values of equity investments	50,277	0	0
Net income	293,814	190,993	406,328
Royalty revenue from a related party
Income statements of TRC
Total net revenue	326,794	261,016	261,004
Revenue from collaborative arrangements with a related party
Income statements of TRC
Total net revenue	10,000	0	$ 0
Theravance Respiratory Company, LLC
Assets
Cash and cash equivalents	38,081	22,339
Receivables from collaborative arrangements	24,946	14,388
Prepaid expenses and other current assets	0	10
Equity and other long-term investments	16,959	0
Total assets	79,986	36,737
Liabilities and LLC Members' Equity
Current liabilities	508	3,069
LLC members' equity	79,478	33,668
Total liabilities and stockholders' equity	79,986	36,737
Income statements of TRC
Total net revenue	83,089	42,790
Operating expenses	2,612	3,380
Income from operations	80,477	39,410
Other income (expense), net	38	243
Changes in fair values of equity investments	1,147	0
Net income	81,662	39,653
Theravance Respiratory Company, LLC | Royalty revenue from a related party
Income statements of TRC
Total net revenue	73,089	42,790
Theravance Respiratory Company, LLC | Revenue from collaborative arrangements with a related party
Income statements of TRC
Total net revenue	$ 10,000	$ 0