Available-for-Sale Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Available-for-sale securities
Amortized Cost	$ 146,460	$ 176,778
Gross Unrealized Gains	8	0
Gross Unrealized Losses	0	(2)
Estimated Fair Value	$ 146,468	176,776
Maturity period for marketable securities
Maximum contractual maturity period	1 year
Average duration	2 months
Theravance Biopharma
Maturity period for marketable securities
Gain on sale	$ 1,200
Cash and cash equivalents
Available-for-sale securities
Estimated Fair Value	90,696	148,673
Short-term marketable securities
Available-for-sale securities
Estimated Fair Value	55,772	28,103
U.S. government agencies
Available-for-sale securities
Amortized Cost	19,913	14,406
Gross Unrealized Gains	8	0
Gross Unrealized Losses	0	(1)
Estimated Fair Value	19,921	14,405
U.S. corporate notes
Available-for-sale securities
Amortized Cost		2,702
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Estimated Fair Value		2,701
U.S. commercial paper
Available-for-sale securities
Amortized Cost	64,838	10,997
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	64,838	10,997
Money market funds
Available-for-sale securities
Amortized Cost	61,709	148,673
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 61,709	$ 148,673

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Represents the maximum maturity period for marketable debt securities.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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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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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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