Marketable Securities (Tables)

12 Months Ended

Jan. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Securities

As of January 31, 2020 and 2019, our marketable securities consisted of the following: 

	As of January 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Commercial paper	$	37,894	$	—	$	—	$	37,894
Agency bonds	141,157		49		(43)		141,163
Corporate and other debt securities	320,407		775		(16)		321,166
U.S. government agency securities	71,794		45		(2)		71,837
Marketable securities	$	571,252	$	869	$	(61)	$	572,060

	As of January 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(in thousands)
Commercial paper	$	1,243	$	—	$	—	$	1,243
Corporate bonds	53,267		—		(53)		53,214
Agency bonds	32,675		—		(71)		32,604
U.S. government agency securities	24,028		—		(11)		24,017
Treasury bills	1,699		—		—		1,699
Marketable securities	$	112,912	$	—	$	(135)	$	112,777

Summary of Contractual Maturities of Marketable Securities

The following table presents the contractual maturities of our marketable securities as of January 31, 2020 and 2019:

	As of January 31,
	2020		2019
	(in thousands)
Less than one year	$	315,900	$	85,077
Due in one to five years	256,160		27,700
Total	$	572,060	$	112,777