Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Operating expenses:
Research and development (includes $814 and $1,789 of share-based compensation expense for the three and six months ended September 30, 2016, respectively)	$ 3,753	$ 18,326
General and administrative (includes $1,336 and $2,982 of share-based compensation expense for the three and six months ended September 30, 2016, respectively)	2,967	5,529
Total operating expenses	6,720	23,855
Other expense:
Changes in the fair value of the warrant liability	(27,984)	(29,817)
Loss before provision for income tax	(34,704)	(53,672)
Income tax expense	8	11
Net loss	(34,712)	(53,683)
Comprehensive loss	$ (34,712)	$ (53,683)
Net loss per common share — basic and diluted (in USD per share)	$ (0.82)	$ (1.29)
Weighted average common shares outstanding — basic and diluted (in shares)	42,512,254	41,646,657