Fair Value of Financial Instruments (Tables)

6 Months Ended

Oct. 31, 2014

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present our assets and liabilities that we measured at fair value on a recurring basis as of October 31, 2014 and April 30, 2014, respectively, and indicates the fair value hierarchy of the valuation techniques we used to determine such fair value (in thousands):

	October 31, 2014
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance
Cash equivalents	$	38,140	$	—	$	—	$	38,140
Marketable securities		8,314		20,304		—		28,618
Total	$	46,454	$	20,304	$	—	$	66,758

	April 30, 2014
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance
Cash equivalents	$	51,561	$	—	$	—	$	51,561
Marketable securities		8,338		15,167		—		23,505
Total	$	59,899	$	15,167	$	—	$	75,066