Marketable Securities (Tables)

9 Months Ended

Oct. 31, 2015

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

The following is a summary of our marketable securities as of October 31, 2015 (in thousands).

	October 31, 2015
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gain		Loss			Fair Value
Corporate paper	$	3,094	$	1		—		$	3,095
Corporate debt securities		15,869		2		(4	)		15,867
Asset-backed securities		6,244		—		(2	)		6,242
	$	25,207	$	3	$	(6	)	$	25,204

Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity

The amortized cost and estimated fair value of our marketable securities as of October 31, 2015 are shown below by contractual maturity (in thousands).

	October 31, 2015
	Amortized		Estimated
	Cost		Fair Value
Less than one year	$	19,351	$	19,350
Due in one to five years		5,856		5,854
	$	25,207	$	25,204