STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Costs and expenses:
Research and development	$ 740	$ 3,488	$ 3,614	$ 11,242
General and administrative	922	987	2,977	3,173
Total costs and expenses	1,662	4,475	6,591	14,415
Loss from operations	(1,662)	(4,475)	(6,591)	(14,415)
Interest and other income	40	44	124	128
Interest expense	(2)	(2)	(8)	(6)
Loss before income taxes	(1,624)	(4,433)	(6,475)	(14,293)
Benefit from income taxes	31		31
Net loss	(1,593)	(4,433)	(6,444)	(14,293)
Change in unrealized loss on marketable securities		2	2	16
Comprehensive loss	$ (1,593)	$ (4,431)	$ (6,442)	$ (14,277)
Net loss per share:
Basic and diluted	$ (0.11)	$ (0.39)	$ (0.47)	$ (1.43)
Weighted average shares outstanding:
Basic and diluted	13,923,825	11,502,654	13,823,793	9,982,739