Short-term Investments (Tables) - Short-term Investments

9 Months Ended

Oct. 31, 2017

Schedule Of Available For Sale Securities [Line Items]

Summary of Short-term Investments

Short-term investments consisted of the following (in thousands):

	As of October 31, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	19,621	$	(20	)	$	1	$	19,602
Commercial paper		19,450		(14	)		—		19,436
U.S. agency securities		5,912		—			—		5,912
U.S. government securities		2,746		(2	)		—		2,744
Asset-backed securities		880		—			—		880
Total short-term investments	$	48,609	$	(36	)	$	1	$	48,574
	As of January 31, 2017
	Amortized Cost		Unrealized Losses			Unrealized Gains		Fair Value
Corporate debt securities	$	18,455	$	(20	)	$	1	$	18,436
Commercial paper		5,386		—			—		5,386
U.S. agency securities		5,774		—			3		5,777
U.S. government securities		17,793		(2	)		7		17,798
Asset-backed securities		1,814		—			—		1,814
Total short-term investments	$	49,222	$	(22	)	$	11	$	49,211

Schedule of Cost Basis and Fair Value of Short-term Investments by Contractual Maturity

The cost basis and fair value of short-term investments by contractual maturity were as follows (in thousands):

	As of October 31, 2017				As of January 31, 2017
	Amortized Value		Fair Value		Amortized Value		Fair Value
One year or less	$	40,441	$	40,419	$	44,806	$	44,794
Over one year and less than two years		8,168		8,155		4,416		4,417
Total	$	48,609	$	48,574	$	49,222	$	49,211