Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Grant	$ 1,149	$ 1,073	$ 3,381	$ 4,500
Operating expenses:
Research and development	5,385	3,129	13,402	7,487
General and administrative	2,065	1,361	6,342	4,331
Total operating expenses	7,450	4,490	19,744	11,818
Loss from operations	(6,301)	(3,417)	(16,363)	(7,318)
Other income (expense):
Interest income	72	5	172	11
Other expense, net	(9)	(1)	(24)	(1)
Total other income	63	4	148	10
Net loss	(6,238)	(3,413)	(16,215)	(7,308)
Deemed dividend to convertible preferred stockholders				(228)
Net loss attributable to common stockholders	$ (6,238)	$ (3,413)	$ (16,215)	$ (7,536)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.47)	$ (5.57)	$ (1.89)	$ (12.76)
Weighted-average common shares outstanding, basic and diluted	13,326,093	612,917	8,598,268	590,775