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Related-Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues from GSK
Total revenues	$ 1,128	$ 1,441	$ 3,274	$ 5,621
Contract revenue [Member] \| Glaxo Group Limited [Member]
Revenues from GSK
Total revenues		534		2,900
Recognition of up-front payments [Member] \| Glaxo Group Limited [Member]
Revenues from GSK
Total revenues	$ 1,128	$ 907	$ 3,274	$ 2,721

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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