Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating expenses:
Research and development (includes $860 and $975 of share-based compensation expense for the three months ended June 30, 2017 and 2016, respectively)	$ 17,708	$ 14,573
General and administrative (includes $1,341 and $1,646 of share-based compensation expense for the three months ended June 30, 2017 and 2016, respectively)	4,182	2,562
Total operating expenses	21,890	17,135
Other expenses:
Changes in the fair value of the warrant liability	0	1,832
Other expense	342	0
Loss before provision for income taxes	(22,232)	(18,967)
Income tax expense	1,085	3
Net loss	$ (23,317)	$ (18,970)
Net loss per common share — basic and diluted (in USD per share)	$ (0.39)	$ (0.47)
Weighted average common shares outstanding — basic and diluted (in shares)	59,247,273	40,771,548