Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

The following table presents 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 October 31, 2020
	Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Financial Assets:
Money market funds	$	224,349	$	224,349	$	—	$	—
Treasury bills	17,419		—		17,419		—
Corporate debt securities	1,012		—		1,012		—
Cash equivalents	242,780		224,349		18,431		—
Commercial paper	6,244		—		6,244		—
Agency bonds	409,473		—		409,473		—
Corporate and other debt securities	466,946		—		466,946		—
U.S. government agency securities	144,354		—		144,354		—
Treasury bills	114,408		—		114,408		—
Marketable securities	1,141,425		—		1,141,425		—
Certificate of deposit included in prepaid expenses and other current assets	100		—		100		—
Certificates of deposit included in other assets, noncurrent	2,215		—		2,215		—
Convertible Note included in other assets, noncurrent	5,092		—		—		5,092
Total financial assets	$	1,391,612	$	224,349	$	1,162,171	$	5,092

	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	$	—