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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses
Research and development	$ 832	$ 2,297	$ 2,480	$ 5,286
General and administrative	1,269	1,792	2,999	3,678
Restructuring expense	490		490
Total operating expenses	2,591	4,089	5,969	8,964
Loss from operations	(2,591)	(4,089)	(5,969)	(8,964)
Other income (expense), net	5	(4)	35	(10)
Warrant inducement expense			(4,829)
Net loss and comprehensive loss	$ (2,586)	$ (4,093)	$ (10,763)	$ (8,974)
Net loss per share, basic and diluted	$ (0.15)	$ (0.35)	$ (0.63)	$ (0.85)
Weighted-average common shares outstanding, basic and diluted	16,981,540	11,751,110	17,124,331	10,595,511

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