Condensed Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares	Common Shares Subscribed	Additional Paid in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to adopt ASU 2016-09	$ 0			$ 122		$ (122)
Beginning balance (in shares) at Mar. 31, 2017	60,275,757	60,275,757
Beginning balance at Mar. 31, 2017	$ 166,776	$ 1	$ (1)	251,733	$ 140	(85,097)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued to settle the warrant liability to Takeda (in shares)		4,432
Shares issued to settle the warrant liability to Takeda	58	$ 0		58
Share-based compensation expense (in shares)		564,111
Share-based compensation expense	4,473	$ 0		4,473
Capital contribution — share-based compensation	477			477
Translation adjustment	148				148
Stock option exercises (in shares)		4,936
Stock option exercises	12			12
Net loss	$ (53,225)					(53,225)
Ending balance (in shares) at Sep. 30, 2017	60,849,236	60,849,236
Ending balance at Sep. 30, 2017	$ 118,719	$ 1	$ (1)	$ 256,875	$ 288	$ (138,444)