Concentration of Business Risk (Tables)

6 Months Ended

Jun. 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 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	%