Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Net loss	$ (17,368)	$ (18,539)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(61)	(70)
Unrealized loss on investments	(48)	(22)
Total other comprehensive loss, net of tax	(109)	(92)
Comprehensive loss	$ (17,477)	$ (18,631)