Condensed Consolidated Statement of Shareholders' Deficit - 6 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Shares	Common Shares Subscribed	Additional Paid in Capital	Accumulated Deficit
Beginning balance (in shares) at Mar. 31, 2016	37,231,342	37,231,342
Beginning balance at Mar. 31, 2016	$ (223)	$ 1	$ (1)	$ 1,434	$ (1,657)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued to Takeda under the Takeda license agreement (in shares)		5,077,001
Shares issued to Takeda under the Takeda license agreement	7,740	$ 0		7,740
Shares issued to settle the warrant liability to Takeda (in shares)		314,119
Shares issued to settle the warrant liability to Takeda	2,639	$ 0		2,639
Share-based compensation expense (in shares)		1,128,222
Share-based compensation expense	784	$ 0		784
Capital contribution — share-based compensation	3,987			3,987
Capital contribution	831			831
Net loss	$ (53,683)				(53,683)
Ending balance (in shares) at Sep. 30, 2016	43,750,684	43,750,684
Ending balance at Sep. 30, 2016	$ (37,925)	$ 1	$ (1)	$ 17,415	$ (55,340)