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Fair Value Measurement (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Assets:
Fair value of level 3 financial instruments as of December 31, 2014	$ 322
Assumed payments made by Pfizer or assignee	(390)
Fair value adjustments to co-promote termination liability	68
Note receivable Viking	4,782
Fair value of level 3 financial instrument assets as of December 31, 2015	4,782
Liabilities
Fair value of level 3 financial instruments as of December 31, 2014	11,819
Assumed payments made by Pfizer or assignee	(390)
Payments to CVR holders and other contingency payments	(5,848)
Fair value adjustments to contingent liabilities	3,841
Fair value adjustments to co-promote termination liability	68
Fair value of level 3 financial instruments as of December 31, 2015	9,490
2019 Convertible Senior Notes | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	377,900
Viking Therapeutics, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investment, Quoted Market Value	$ 16,300

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Fair Value Adjustment

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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