Marketable Securities

9 Months Ended

Oct. 31, 2015

Investments Debt And Equity Securities [Abstract]

Marketable Securities

Note 4. Marketable Securities

We held no marketable securities as of January 31, 2015. 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

None of our marketable securities had been in an unrealized loss position for greater than 12 months as of October 31, 2015. Based on our evaluation of available evidence we concluded that the gross unrealized losses on our marketable securities as of October 31, 2015, are temporary in nature.

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

Net realized gains and losses from sales of our available-for-sale securities for the three and nine months ended October 31, 2015 were not significant.