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Financing Arrangements (Notes Payable) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Notes Payable, Current and Noncurrent [Abstract]
Net carrying amount	$ 202,951	$ 195,908
Total notes payable	202,951	196,242
2019 convertible senior notes
Notes Payable, Current and Noncurrent [Abstract]
Principal amount outstanding	245,000	245,000
Unamortized discount	(42,049)	(49,092)
Net carrying amount	202,951	195,908
Convertible notes payable, Viking Therapeutics, Inc.
Notes Payable, Current and Noncurrent [Abstract]
Current notes payable	$ 0	$ 334

X

- Definition

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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