Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses:
Research and development	$ 10,720	$ 2,008	$ 15,565	$ 2,383
General and administrative	2,477	577	6,310	1,006
Total operating expenses	13,197	2,585	21,875	3,389
Loss from operations	(13,197)	(2,585)	(21,875)	(3,389)
Other expense, net:
Interest expense, net			(685)
Other expense, net	(4)		(389)
Net loss and comprehensive loss	$ (13,201)	$ (2,585)	$ (22,949)	$ (3,389)
Net loss per common share, basic and diluted	$ (1.87)	$ (13.34)	$ (5.73)	$ (17.48)
Weighted-average common shares outstanding, basic and diluted	7,069,257	193,850	4,002,454	193,850