Concentration of Business Risk

6 Months Ended

Jun. 30, 2014

Concentration of Business Risk [Abstract]

Concentration of Business Risk

5.Concentration of Business Risk

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 June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Partner A		60	%		19	%		52	%		14	%
Partner B		27	%		40	%		22	%		22	%
Partner C		0	%		20	%		0	%		40	%
Partner D		6	%		6	%		8	%		15	%

Contract receivables from three significant partners comprised approximately 97 percent of our contract receivables at June 30, 2014. Contract receivables from three significant partners comprised approximately 91 percent of our contract receivables at December 31, 2013.