Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating expenses:
Research and development	$ 5,109	$ 6,816	$ 10,307	$ 11,196
General and administrative	2,717	1,623	4,588	3,318
Total operating expenses	7,826	8,439	14,895	14,514
Loss from operations	(7,826)	(8,439)	(14,895)	(14,514)
Interest income	1,166	92	1,871	168
Other income	200		200
Net loss	$ (6,460)	$ (8,347)	$ (12,824)	$ (14,346)
Net loss per common share:
Basic and diluted net loss per common share (in dollars per share)	$ (0.45)	$ (0.69)	$ (0.90)	$ (1.20)
Basic and diluted weighted average number of common shares outstanding	14,383,720	12,039,005	14,256,501	11,997,602