Concentration of Business Risk (Tables)

9 Months Ended

Sep. 30, 2014

Concentration of Business Risk [Abstract]

Schedule of revenue from significant partners

We have historically funded our operations from collaborations with corporate partners and a relatively small number of partners have accounted for a significant percentage of our revenue. Revenue from significant partners, which is defined as ten percent or more of our total revenue, was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Partner A		72%		25%		59%		16%
Partner B		12%		48%		9%		22%
Partner C		1%		18%		15%		21%
Partner D		0%		0%		0%		31%