Financial Instruments and Fair Value (Tables)

12 Months Ended

Jan. 31, 2016

Investments All Other Investments [Abstract]

Schedule of Available-for-Sale Securities at Fair Value

All of the investments are classified as available-for-sale securities and reported at fair value in the consolidated balance sheets as follows:

	As of January 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	530	$	—	$	—		$	530
Commercial paper		2,598		—		—			2,598
Corporate bonds		21,342		7		(9	)		21,340
Asset-backed securities		4,586		—		(1	)		4,585
U.S. government securities		9,274		4		(6	)		9,272
Agency bonds		2,044		—		(2	)		2,042
Total cash equivalents and marketable securities	$	40,374	$	11	$	(18	)	$	40,367
	As of January 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market funds	$	2,427	$	—	$	—		$	2,427
Commercial paper		1,497		—		—			1,497
Corporate bonds		32,356		9		(10	)		32,355
Asset-backed securities		3,851		—		—			3,851
Total cash equivalents and marketable securities	$	40,131	$	9	$	(10	)	$	40,130

Schedule of Cash Equivalents and Marketable Securities

	As of
	January 31, 2016		January 31, 2015
	(in thousands)
Included in cash equivalents	$	530	$	2,427
Included in marketable securities		39,837		37,703
Total cash equivalents and marketable securities	$	40,367	$	40,130

Summary of Contractual Maturities of Investments

The contractual maturities of the investments at January 31, 2016 and 2015 were as follows:

	As of
	January 31, 2016		January 31, 2015
	(in thousands)
Due within one year	$	33,449	$	37,559
Due within one to two years		6,918		2,571
Total cash equivalents and marketable securities	$	40,367	$	40,130

Schedule of Fair Value of Financial Instruments Measured on Recurring Basis

The following tables present the fair value of the financial instruments measured on a recurring basis as of January 31, 2016 and 2015, respectively:

	As of January 31, 2016
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	530	$	530	$	—	$	—
Commercial paper		2,598		—		2,598		—
Corporate bonds		21,340		—		21,340		—
Asset-backed securities		4,585		—		4,585		—
U.S. government securities		9,272		—		9,272		—
Agency bonds		2,042		—		2,042		—
Total cash equivalents and marketable securities	$	40,367	$	530	$	39,837	$	—
	As of January 31, 2015
	Total		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	2,427	$	2,427	$	—	$	—
Commercial paper		1,497		—		1,497		—
Corporate bonds		32,355		—		32,355		—
Asset-backed securities		3,851		—		3,851		—
Total cash equivalents and marketable securities	$	40,130	$	2,427	$	37,703	$	—