Short-Term Investments (Tables)

12 Months Ended

Jan. 31, 2014

Schedule Of Investments [Abstract]

Schedule of Short-Term Investments

At January 31, 2014, short-term investments consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
Corporate notes and bonds	$	10,499	$	9	$	(1	)	$	10,507
U.S. agency obligations		15,111		7		—			15,118
Total available-for-sale securities	$	25,610	$	16	$	(1	)	$	25,625

At January 31, 2013, short-term investments consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
Commercial paper	$	2,097	$	—	$	—		$	2,097
Corporate notes and bonds		11,474		7		(2	)		11,479
Certificate of deposits		700		—		—			700
Total available-for-sale securities	$	14,271	$	7	$	(2	)	$	14,276

Summary of Estimated Fair Value of Short-Term Investments, Designated as Available-for-Sale and Classified by Contractual Maturity

The following table summarizes the estimated fair value of our short-term investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of the dates shown (in thousands):

	January 31,
	2014		2013
Due in one year	$	17,667	$	9,829
Due in greater than one year		7,958		4,447
Total	$	25,625	$	14,276

Schedule of Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category

The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment category as of January 31, 2014 (in thousands):

	Fair Value		Gross Unrealized Losses
Corporate notes and bonds	$	1,403	$	(1	)

The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment category as of January 31, 2013 (in thousands):

	Fair Value		Gross Unrealized Losses
Corporate notes and bonds	$	3,570	$	(2	)