Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating expenses
Research and development	$ 1,651	$ 517	$ 4,077	$ 1,529
General and administrative	1,848	2,448	5,406	9,487
Total operating expenses	3,499	2,965	9,483	11,016
Loss from operations	(3,499)	(2,965)	(9,483)	(11,016)
Other income (expense), net	3	(5)	(8)	10
Net loss and comprehensive loss	$ (3,496)	$ (2,970)	$ (9,491)	$ (11,006)
Net loss per share, basic and diluted	$ (0.37)	$ (0.43)	$ (1.07)	$ (2.25)
Weighted-average common shares outstanding, basic and diluted	9,420,039	6,943,058	8,864,895	3,845,258