License and Collaboration Agreements (Tables)

12 Months Ended

Dec. 31, 2011

License and Collaboration Agreements [Abstract]

License, collaboration, and other revenue

		Year Ended December 31,
Partner	Agreement	2011		2010		2009
Baxter Healthcare	Hemophilia	$	5,646	$	1,701	$	2,055
F. Hoffmann — La Roche	PEGASYS®		5,131		5,131		214
Amgen, Inc.	Neulasta®		5,000		833		—
Bayer Healthcare LLC	BAY41-6551 (Amikacin Inhale)		2,992		3,300		4,928
AstraZeneca AB	NKTR-118 and NKTR-119		2,496		107,854		25,073
Other			15,024		5,553		4,373
License, collaboration and other revenue		$	36,289	$	124,372	$	36,643