Cash Equivalents and Short-Term Investments (Tables)

6 Months Ended

Jul. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments

The amortized costs, unrealized gains and losses and estimated fair values of the Company’s cash equivalents and short-term investments as of July 31, 2017 and January 31, 2017 were as follows (in thousands):

	As of July 31, 2017
	(unaudited)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	95,495	$	—	$	—		$	95,495
Commercial paper	15,020		—		—			15,020
U.S. treasury securities	4,996		—		—			4,996
Total cash equivalents	$	115,511	$	—	$	—		$	115,511
Investments:
Commercial paper	18,913		—		—			18,913
U.S. treasury securities	45,083		1		(3		)	45,081
Corporate debt securities	22,771		1		(11		)	22,761
Total short-term investments	$	86,767	$	2	$	(14	)	$	86,755
Total	$	202,278	$	2	$	(14	)	$	202,266

	As of January 31, 2017
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	10,565	$	—	$	—		$	10,565
Investments:
Asset-backed securities	1,538		—		—			1,538
Corporate debt securities	12,842		13		(3		)	12,852
Total short-term investments	$	14,380	$	13	$	(3	)	$	14,390
Total	$	24,945	$	13	$	(3	)	$	24,955

Schedule of Contractual Maturities of Short-term Investments

The following tables present the contractual maturities of the Company’s short-term investments as of July 31, 2017 and January 31, 2017 (in thousands):

	As of July 31, 2017
	(unaudited)
	Amortized Cost		Estimated Fair Value
Due within one year	$	58,288	$	58,276
Due between one to five years	28,479		28,479
	$	86,767	$	86,755

	As of January 31, 2017
	Amortized Cost		Estimated Fair Value
Due within one year	$	12,842	$	12,852
Due between one to five years	1,538		1,538
	$	14,380	$	14,390