Condensed Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating expenses:
Research and development	$ 1,387	$ 746
General and administrative	1,241	1,135
Total operating expenses	2,628	1,881
Loss from operations	(2,628)	(1,881)
Investment income	1	1
Other (expense) income, net	(3)
Net loss and comprehensive loss	$ (2,630)	$ (1,880)
Basic and diluted net loss per share attributable to common stock	$ (0.29)	$ (0.97)
Weighted-average number of common shares outstanding	9,054	1,940