Available-for-Sale Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale securities
Amortized Cost	$ 176,778	$ 285,483
Gross Unrealized Gains	0	35
Gross Unrealized Losses	(2)	(122)
Other Than Temporary Impairment Loss	0	(3,752)	$ 0
Estimated Fair Value	$ 176,776	281,644
Maturity period for marketable securities
Maximum contractual maturity period	1 year
Average duration	1 month
Proceeds from sale of available-for-sale securities	$ 108,077	7,211	$ 22,600
Theravance Biopharma
Maturity period for marketable securities
Gain on sales of the securities	1,200
Issuer of available-for-securities other than Theravance Biopharma
Maturity period for marketable securities
Proceeds from sale of available-for-sale securities	100,400
Cash and cash equivalents
Available-for-sale securities
Estimated Fair Value	148,673	95,090
Short-term investments
Available-for-sale securities
Estimated Fair Value	28,103	143,698
Marketable securities
Available-for-sale securities
Estimated Fair Value	0	42,856
U.S. government securities
Available-for-sale securities
Amortized Cost		30,019
Gross Unrealized Gains		24
Gross Unrealized Losses		0
Other Than Temporary Impairment Loss		0
Estimated Fair Value		30,043
U.S. government agency securities
Available-for-sale securities
Amortized Cost	14,406	34,756
Gross Unrealized Gains	0	6
Gross Unrealized Losses	(1)	(12)
Other Than Temporary Impairment Loss	0	0
Estimated Fair Value	14,405	34,750
Corporate notes
Available-for-sale securities
Amortized Cost	2,702	80,880
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(1)	(110)
Other Than Temporary Impairment Loss	0	0
Estimated Fair Value	2,701	80,775
Commercial paper
Available-for-sale securities
Amortized Cost	10,997	34,469
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Other Than Temporary Impairment Loss	0	0
Estimated Fair Value	10,997	34,469
Equity securities \| Theravance Biopharma
Available-for-sale securities
Amortized Cost		10,269
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Other Than Temporary Impairment Loss		(3,752)
Estimated Fair Value		6,517
Money market funds
Available-for-sale securities
Amortized Cost	148,673	95,090
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Other Than Temporary Impairment Loss	0	0
Estimated Fair Value	$ 148,673	$ 95,090

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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