Loss Per Share Applicable to Common Stockholders (Tables)

3 Months Ended

Jul. 31, 2012

Loss Per Share Applicable to Common Stockholders [Abstract]

Computations of loss per share applicable to common stockholders

	Three Months Ended July 31,
	2012			2011
Net loss	$	(18,539	)	$	(5,536	)
Less accretion of redeemable convertible preferred stock		—			(13	)
Loss applicable to common stockholders	$	(18,539	)	$	(5,549	)
Basic and diluted earnings per share	$	(0.30	)	$	(0.29	)
Weighted average number of shares		62,451			18,817
Potentially dilutive securities (1):
Outstanding stock options		7,849			4,575
Redeemable convertible preferred shares		—			27,897

(1) The impact of potentially dilutive securities on earnings per share is anti-dilutive in a period of net loss.