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STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Costs and expenses:
Research and development	$ 4,239	$ 14,076
General and administrative	3,879	4,636
Total costs and expenses	8,118	18,712
Loss from operations	(8,118)	(18,712)
Interest and other income	162	167
Interest expense	(8)	(6)
Loss before income taxes	(7,964)	(18,551)
Income tax benefit	31	61
Net loss	(7,933)	(18,490)
Change in unrealized loss on marketable securities	2	17
Comprehensive loss	$ (7,931)	$ (18,473)
Net loss per share:
Basic and diluted	$ (0.57)	$ (1.77)
Weighted average shares outstanding:
Basic and diluted	13,849,055	10,431,391

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