Liability related to sale of future royalties (Tables)

6 Months Ended

Jun. 30, 2012

Liability Related to Sale of Future Royalties [Abstract]

Summary of liability related to potential future royalties

	Six months ended June 30, 2012
Liability related to sale of future royalties - beginning balance	$	—
Proceeds from sale of future royalties		124,000
Non-cash interest expense		7,155
CIMZIA® and MIRCERA® royalties remitted to RPI		(3,469	)
Liability related to sale of future royalties - ending balance	$	127,686