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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Costs and expenses:
Research and development	$ 1,720	$ 3,246
General and administrative	1,053	1,135
Total costs and expenses	2,773	4,381
Loss from operations	(2,773)	(4,381)
Interest and other income	41	45
Interest expense	(3)	(2)
Net loss	(2,735)	(4,338)
Change in unrealized loss on marketable securities	2	10
Comprehensive loss	$ (2,733)	$ (4,328)
Net loss per share:
Basic and diluted	$ (0.20)	$ (0.48)
Weighted average shares outstanding:
Basic and diluted	13,620,710	9,094,276

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