Condensed Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
License fees	$ 302	$ 9,637	$ 302	$ 9,637
Collaborative revenue	658	336	836	336
Total revenue	960	9,973	1,138	9,973
Operating expenses:
Research and development	3,200	2,021	5,401	2,943
General and administrative	1,472	1,033	2,870	1,621
Total operating expenses	4,672	3,054	8,271	4,564
Operating (loss) income	(3,712)	6,919	(7,133)	5,409
Interest income (expense), net	56	(1,602)	78	(2,731)
(Loss) income before benefit from income taxes	(3,656)	5,317	(7,055)	2,678
Benefit from income taxes	11	20	27	27
Net (loss) income	(3,645)	5,337	(7,028)	2,705
Net (loss) income available to common stockholders - Basic	(3,645)	1,468	(7,028)	940
Net (loss) income available to common stockholders - Diluted	$ (3,645)	$ 5,337	$ (7,028)	$ 3,596
(Loss) income per share available to common stockholders - Basic	$ (0.16)	$ 0.34	$ (0.37)	$ 0.24
(Loss) income per share available to common stockholders - Diluted	$ (0.16)	$ 0.33	$ (0.37)	$ 0.23
Weighted average shares:
Basic	22,608,324	4,288,243	19,150,412	3,975,463
Diluted	22,608,324	15,972,449	19,150,412	15,668,778