Cash Equivalents and Short-term Investments (Tables)

3 Months Ended

Apr. 30, 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 April 30, 2017 and January 31, 2017 were as follows (in thousands):

	As of April 30, 2017
	(unaudited)
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	217,651	$	—	$	—	$	217,651
Investments:
Corporate debt securities	2,500		—		—		2,500
Total short-term investments	$	2,500	$	—	$	—	$	2,500
Total	$	220,151	$	—	$	—	$	220,151

	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 April 30, 2017 and January 31, 2017 (in thousands):

	As of April 30, 2017
	(unaudited)
	Amortized Cost		Estimated Fair Value
Due within one year	$	2,500	$	2,500
Due between one to five years	—		—
	$	2,500	$	2,500

	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