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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Costs and expenses:
Research and development	$ 3,246	$ 2,594
General and administrative	1,135	1,074
Total costs and expenses	4,381	3,668
Loss from operations	(4,381)	(3,668)
Interest and other income	45	21
Interest expense	(2)
Net loss	(4,338)	(3,647)
Change in unrealized loss on marketable securities	10	6
Comprehensive loss	$ (4,328)	$ (3,641)
Net loss per share:
Basic and diluted	$ (0.48)	$ (0.40)
Weighted average shares outstanding:
Basic and diluted	9,094,276	9,053,186

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