Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Grant	$ 1,261	$ 1,149	$ 3,723	$ 3,381
Operating expenses:
Research and development	6,239	5,385	17,024	13,402
General and administrative	3,020	2,065	7,749	6,342
Total operating expenses	9,259	7,450	24,773	19,744
Loss from operations	(7,998)	(6,301)	(21,050)	(16,363)
Other income (expense):
Interest income	136	72	332	172
Other expense	(12)	(9)	(35)	(24)
Total other income	124	63	297	148
Net loss	$ (7,874)	$ (6,238)	$ (20,753)	$ (16,215)
Net loss per share, basic and diluted	$ (0.48)	$ (0.47)	$ (1.42)	$ (1.89)
Weighted-average common shares outstanding, basic and diluted	16,409,871	13,326,093	14,641,082	8,598,268