Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating expenses:
Research and development	$ 2,075	$ 2,457	$ 6,429	$ 6,107
General and administrative	1,187	1,142	3,855	3,597
Total operating expenses	3,262	3,599	10,284	9,704
Loss from operations	(3,262)	(3,599)	(10,284)	(9,704)
Interest income	26	7	84	15
Other income (expense), net			(1)	1
Net loss and comprehensive loss	$ (3,236)	$ (3,592)	$ (10,201)	$ (9,688)
Basic and diluted net loss per share attributable to common stock	$ (0.12)	$ (0.14)	$ (0.38)	$ (0.39)
Weighted-average number of common shares outstanding	26,545	26,545	26,545	24,748