CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating expenses:
Research and development	$ 9,535	$ 1,737
General and administrative	3,604	892
Total operating expenses	13,139	2,629
Loss from operations	(13,139)	(2,629)
Other income, net	100	6
Net loss	(13,039)	(2,623)
Accretion of convertible preferred stock		(657)
Net loss attributable to common stockholders	$ (13,039)	$ (3,280)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.65)	$ (1.61)
Weighted average common shares outstanding, basic and diluted (in shares)	20,171,518	2,034,850
Other comprehensive income (loss):
Unrealized gain on marketable securities, net of tax of $0	$ 142	$ 3
Foreign currency translation adjustments	10
Total other comprehensive income	152	3
Comprehensive loss	$ (12,887)	$ (2,620)