Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
License and milestone fees		$ 302		$ 302
Collaborative revenue	$ 874	526	$ 1,363	677
Clinical compound revenue		132		159
Total revenue	874	960	1,363	1,138
Operating expenses:
Research and development	4,684	3,200	8,069	5,401
General and administrative	1,922	1,472	3,744	2,870
Total operating expenses	6,606	4,672	11,813	8,271
Operating loss	(5,732)	(3,712)	(10,450)	(7,133)
Interest income	13	56	27	78
Loss before benefit from income taxes	(5,719)	(3,656)	(10,423)	(7,055)
Benefit from income taxes	35	11	50	27
Net loss	$ (5,684)	$ (3,645)	$ (10,373)	$ (7,028)
Net loss per share -Basic and Diluted	$ (0.25)	$ (0.16)	$ (0.45)	$ (0.37)
Weighted average shares:
Basic and Diluted	22,828,612	22,608,324	22,818,601	19,150,412