Liability Related to Sale of Future Royalties (Tables)

3 Months Ended

Mar. 31, 2012

Liability Related to Sale of Future Royalties [Abstract]

Summary of liability related to potential future royalties

	Three months ended March 31, 2012
Beginning balance	$	—
Proceeds from sale of future royalties		124,000
Non-cash interest expense		1,785
CIMZIA® and MIRCERA® royalties remitted to RPI		—
Ending balance	$	125,785