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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Costs and expenses:
Research and development	$ 4,508	$ 2,913	$ 7,754	$ 5,507
General and administrative	1,051	1,028	2,186	2,102
Total costs and expenses	5,559	3,941	9,940	7,609
Loss from operations	(5,559)	(3,941)	(9,940)	(7,609)
Interest and other income	39	47	84	68
Interest expense	(2)		(4)
Net loss	(5,522)	(3,894)	(9,860)	(7,541)
Change in unrealized loss on marketable securities	4	7	14	13
Comprehensive loss	$ (5,518)	$ (3,887)	$ (9,846)	$ (7,528)
Net loss per share:
Basic and diluted	$ (0.59)	$ (0.43)	$ (1.07)	$ (0.83)
Weighted average shares outstanding:
Basic and diluted	9,324,822	9,065,922	9,210,186	9,059,554

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