Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses:
Research and development	$ 2,374	$ 1,981	$ 4,354	$ 3,650
General and administrative	1,296	1,347	2,668	2,455
Total operating expenses	3,670	3,328	7,022	6,105
Loss from operations	(3,670)	(3,328)	(7,022)	(6,105)
Interest income	29	5	57	8
Other income (expense), net		(1)	(1)	1
Net loss and comprehensive loss	$ (3,641)	$ (3,324)	$ (6,966)	$ (6,096)
Basic and diluted net loss per share attributable to common stock	$ (0.14)	$ (0.13)	$ (0.26)	$ (0.26)
Weighted-average number of common shares outstanding	26,545	26,545	26,545	23,835