Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (15,119)	$ (10,183)
Other comprehensive loss:
Unrealized loss on available-for-sale securities, net of tax	(25)
Comprehensive loss	$ (15,144)	$ (10,183)