Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies [Abstract]

Contingent Potential Milestone Payments to Strategic Business Partners

The table below summarizes contingent potential milestone payments due to strategic partners in the years 2014 and beyond, assuming all such contingencies occur (in thousands):

Year ending December 31,	Milestone Payments
2014	$	4,524
2015		598
2016		200
Total	$	5,322