STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Costs and expenses:
Research and development	$ 12,348	$ 7,063
General and administrative	4,265	4,392
Total costs and expenses	16,613	11,455
Loss from operations	(16,613)	(11,455)
Interest and other income	169	14
Interest expense		(4)
Net loss	(16,444)	(11,445)
Change in unrealized loss on marketable securities	(19)
Comprehensive loss	$ (16,463)	$ (11,445)
Net loss per share:
Basic and diluted	$ (1.81)	$ (1.82)
Weighted average shares outstanding:
Basic and diluted	9,067,438	6,289,305