Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Grant	$ 1,510	$ 982
Operating expenses:
Research and development	6,870	4,949
General and administrative	2,885	2,364
Total operating expenses	9,755	7,313
Loss from operations	(8,245)	(6,331)
Other income (expense):
Interest income	143	95
Other expense	(17)	(11)
Total other income	126	84
Net loss	$ (8,119)	$ (6,247)
Net loss per share, basic and diluted	$ (0.49)	$ (0.47)
Weighted-average common shares outstanding, basic and diluted	16,672,125	13,365,823