Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

The following tables present information about our financial instruments that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value:

	As of January 31, 2020
	Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Financial Assets:
Money market funds	$	96,486	$	96,486	$	—	$	—
Commercial paper	4,994		—		4,994		—
Agency bonds	9,999		—		9,999		—
Cash equivalents	111,479		96,486		14,993		—
Commercial paper	37,894		—		37,894		—
Agency bonds	141,163		—		141,163		—
Corporate and other debt securities	321,166		—		321,166		—
U.S. government agency securities	71,837		—		71,837		—
Marketable securities	572,060		—		572,060		—
Certificate of deposit included in prepaid expenses and other current assets	100		—		100		—
Certificates of deposit included in other assets, noncurrent	2,301		—		2,301		—
Total financial assets	$	685,940	$	96,486	$	589,454	$	—

	As of January 31, 2019
	Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Financial Assets:
Money market funds	$	78	$	78	$	—	$	—
Cash equivalents	78		78		—		—
Commercial paper	1,243		—		1,243		—
Corporate bonds	53,214		—		53,214		—
Agency bonds	32,604		—		32,604		—
U.S. government agency securities	24,017		—		24,017		—
Treasury bills	1,699		—		1,699		—
Marketable securities	112,777		—		112,777		—
Certificate of deposit included in prepaid expenses and other current assets	200		—		200		—
Certificates of deposit included in other assets, noncurrent	2,144		—		2,144		—
Total financial assets	$	115,199	$	78	$	115,121	$	—
Financial Liabilities:
Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent	$	163	$	—	$	—	$	163
Total financial liabilities	$	163	$	—	$	—	$	163