Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (18,071)	$ (15,119)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities, net of tax	10	(25)
Comprehensive loss	$ (18,061)	$ (15,144)