Marketable Securities and Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2016

Investments Debt And Equity Securities [Abstract]

We held no marketable securities as of January 31, 2015. The following is a summary of our marketable securities as of January 31, 2016 (in thousands).

	January 31, 2016
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gain		Loss			Fair Value
Corporate debt securities	$	5,560	$	—	$	(1	)	$	5,559
Asset-backed securities		1,821		—		(1	)		1,820
	$	7,381	$	—	$	(2	)	$	7,379

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 January 31, 2016 are shown below by contractual maturity (in thousands).

	January 31, 2016
	Amortized		Estimated
	Cost		Fair Value
Less than one year	$	5,560	$	5,559
Due in one to five years		1,821		1,820
	$	7,381	$	7,379

Fair Value of Assets Measured at Fair Value on Recurring Basis

The following tables set forth the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of January 31, 2016 and 2015, using the above input categories (in thousands):

	January 31, 2016
	Level 1		Level 2		Level 3		Fair Value
Assets
Marketable securities:
Corporate debt securities	$	—	$	5,559	$	—	$	5,559
Asset-backed securities		—		1,820		—		1,820
Restricted cash:
Certificates of deposit		—		26,968		—		26,968
Money market funds		984		—		—		984
Total assets measured at fair value	$	984	$	34,347	$	—	$	35,331

	January 31, 2015
	Level 1		Level 2		Level 3		Fair Value
Assets
Restricted cash:
Certificates of deposit	$	—	$	3,367	$	—	$	3,367
Total assets measured at fair value	$	—	$	3,367	$	—	$	3,367

Fair Value of Redeemable Convertible Preferred Stock Warrants

The following table provides a roll-forward of the fair value of the redeemable convertible preferred stock warrants categorized as Level 3 (in thousands):

Balance at January 31, 2013	$	2,869
Remeasurement		8,477
Exercise of redeemable convertible preferred stock warrants		(10,000	)
Balance at January 31, 2014		1,346
Remeasurement		(126	)
Exercise of redeemable convertible preferred stock warrants		(1,220	)
Balance at January 31, 2015	$	—