Condensed Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating expenses:
General and administrative	$ 2,223	$ 1,050
Research and development	5,280	1,176
Total operating expenses	7,503	2,226
Loss from operations	(7,503)	(2,226)
Interest income	12	127
Other expense	(5)	(4)
Loss before income taxes	(7,496)	(2,103)
Provision (benefit) for income taxes	0	0
Net loss	(7,496)	(2,103)
Comprehensive loss	(7,496)	(2,103)
Net loss	(7,496)	(2,103)
Adjustment to redemption value on Series A convertible preferred stock		(149)
Net loss attributable to common stockholders	$ (7,496)	$ (2,252)
Net loss per share:
Basic and diluted (Note 10)	$ (0.79)	$ (0.65)
Number of shares used in per share calculations:
Basic and diluted	9,521,224	3,468,764