Cash Equivalents and Short-Term Investments

The amortized cost, unrealized gain/loss and estimated fair value of the Company’s cash equivalents and short-term investments as of October 31, 2017 and January 31, 2017 were as follows (in thousands):



	As of October 31, 2017
	(unaudited)
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	115,939	$	—	$	—		$	115,939
Total cash equivalents	$	115,939	$	—	$	—		$	115,939
Investments:
Commercial paper	16,973		—		—			16,973
U.S. treasury securities	46,570		—		(57		)	46,513
Corporate debt securities	22,570		—		(13		)	22,557
Total short-term investments	86,113		—		(70		)	86,043
Total	$	202,052	$	—	$	(70	)	$	201,982



	As of January 31, 2017
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	10,565	$	—	$	—		$	10,565
Total cash equivalents	$	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

All short-term investments were designated as available-for-sale securities as of October 31, 2017 and January 31, 2017.

The Company had 17 and five short-term investments in unrealized loss positions as of October 31, 2017 and January 31, 2017, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three and nine months ended October 31, 2017 or 2016.

For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) it has the intention to sell any of these investments and (ii) whether it is not more likely than not that it will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis. Based on this evaluation, the Company determined that there were no other-than-temporary impairments associated with short-term investments as of October 31, 2017 and January 31, 2017.

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



	As of October 31, 2017
	(unaudited)
	Amortized Cost		Estimated Fair Value
Due within one year	$	73,602	$	73,553
Due between one to five years	12,511		12,490
	$	86,113	$	86,043



	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