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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Costs and expenses:
Research and development	$ 3,488	$ 3,720	$ 11,242	$ 9,227
General and administrative	987	992	3,173	3,094
Total costs and expenses	4,475	4,712	14,415	12,321
Loss from operations	(4,475)	(4,712)	(14,415)	(12,321)
Interest and other income	44	53	128	121
Interest expense	(2)		(6)
Net loss	(4,433)	(4,659)	(14,293)	(12,200)
Change in unrealized loss on marketable securities	2	(19)	16	(6)
Comprehensive loss	$ (4,431)	$ (4,678)	$ (14,277)	$ (12,206)
Net loss per share:
Basic and diluted	$ (0.39)	$ (0.51)	$ (1.43)	$ (1.35)
Weighted average shares outstanding:
Basic and diluted	11,502,654	9,068,376	9,982,739	9,062,516

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