Unaudited Condensed Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Expenses:
Research and development	$ 1,597	$ 700	$ 3,593	$ 1,355
General and administrative	2,689	2,463	5,823	6,011
Total expenses	4,286	3,163	9,416	7,366
Loss from operations	(4,286)	(3,163)	(9,416)	(7,366)
Other income:
Other income, net	2	1	4	2
Net loss and comprehensive loss	(4,284)	(3,162)	(9,412)	(7,364)
Preferred stock dividends earned	0	(562)	0	(562)
Net loss attributable to common shareholders	$ (4,284)	$ (3,724)	$ (9,412)	$ (7,926)
Basic and diluted net loss per share (usd per share)	$ (0.63)	$ (6.77)	$ (1.16)	$ (17.57)
Shares used in computing basic and diluted net loss per share	6,836	550	8,122	451