Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (41,777)	$ (8,083)	$ (95,002)	$ (61,766)
Other comprehensive loss:
Foreign currency translation adjustment	(379)	0	(231)	0
Total other comprehensive loss	(379)	0	(231)	0
Comprehensive loss	$ (42,156)	$ (8,083)	$ (95,233)	$ (61,766)