Unaudited Condensed Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Expenses:
Research and development	$ 1,996	$ 655
General and administrative	3,134	3,548
Total expenses	5,130	4,203
Loss from operations	(5,130)	(4,203)
Other income:
Other income, net	2	1
Net loss and comprehensive loss	(5,128)	(4,202)
Preferred stock dividends earned	0	(93)
Net loss attributable to common stockholders	$ (5,128)	$ (4,295)
Net loss per share basic and diluted	$ (0.93)	$ (12.26)
Shares used in computing basic and diluted net loss per share	5,535	350