STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Costs and expenses:
Research and development	$ 662	$ 1,720
General and administrative	1,119	1,053
Total costs and expenses	1,781	2,773
Loss from operations	(1,781)	(2,773)
Interest and other income	38	41
Interest expense	(3)	(3)
Loss before income taxes	(1,746)	(2,735)
Income tax benefit	82
Net loss	(1,664)	(2,735)
Change in unrealized loss on marketable securities		2
Comprehensive loss	$ (1,664)	$ (2,733)
Net loss per share:
Basic and diluted	$ (1.86)	$ (3.61)
Weighted average shares outstanding:
Basic and diluted	895,970	756,706