Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total USD ($)	Common Stock USD ($)	Treasury Stock	Additional Paid-in Capital USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)	Accumulated Deficit USD ($)
Beginning balance at Apr. 30, 2014	$ 206,462	$ 8		$ 398,201	$ 328	$ (192,075)
Beginning balance, Shares at Apr. 30, 2014		77,888	(250)
Excess tax benefit related to stock-based expense	1			1
Stock-based expense	3,246			3,246
Exercise of stock options and vested restricted stock units, Shares		384
Exercise of stock options and vested restricted stock units	574			574
Change in foreign currency translation adjustment	(2)				(2)
Change in unrealized gain on investments	47				47
Net loss applicable to common stockholders	(11,565)					(11,565)
Ending balance at Jul. 31, 2014	$ 198,763	$ 8		$ 402,022	$ 373	$ (203,640)
Ending balance, Shares at Jul. 31, 2014		78,272	(250)