Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended		57 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017
Statement Of Cash Flows [Abstract]
Warrant liability reduced	$ 139	$ 55
Leasehold improvements	$ 374	$ 144	$ 518