Unaudited Condensed Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Expenses:
Research and development	$ 2,625	$ 948	$ 6,218	$ 2,303
General and administrative	2,436	3,225	8,259	9,238
Total expenses	5,061	4,173	14,477	11,541
Loss from operations	(5,061)	(4,173)	(14,477)	(11,541)
Other income:
Other income, net	9	1	13	3
Net loss and comprehensive loss	(5,052)	(4,172)	(14,464)	(11,538)
Convertible preferred stock dividends earned	0	(337)	0	(801)
Net loss attributable to common shareholders	$ (5,052)	$ (4,509)	$ (14,464)	$ (12,339)
Basic and diluted net loss per share (usd per share)	$ (0.37)	$ (5.45)	$ (1.58)	$ (21.35)
Shares used in computing basic and diluted net loss per share	13,646	827	9,131	578