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Fair Value Measurements
12 Months Ended
Jan. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
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, 2021
Fair ValueLevel 1Level 2Level 3
(in thousands)
Financial Assets:
Money market funds$958,357 $958,357 $— $— 
Treasury bills618,498 — 618,498 — 
Cash equivalents1,576,855 958,357 618,498 — 
Commercial paper26,222 — 26,222 — 
Agency bonds461,365 — 461,365 — 
Corporate and other debt securities466,256 — 466,256 — 
U.S. government agency securities834,665 — 834,665 — 
Treasury bills215,902 — 215,902 — 
Marketable securities2,004,410 — 2,004,410 — 
Certificate of deposit included in prepaid expenses and other current assets100 — 100 — 
Certificates of deposit included in other assets, noncurrent2,238 — 2,238 — 
Convertible note included in other assets, noncurrent5,130 — — 5,130 
Total financial assets$3,588,733 $958,357 $2,625,246 $5,130 

As of January 31, 2020
Fair ValueLevel 1Level 2Level 3
(in thousands)
Financial Assets:
Money market funds$96,486 $96,486 $— $— 
Commercial paper4,994 — 4,994 — 
Agency bonds9,999 — 9,999 — 
Cash equivalents111,479 96,486 14,993 — 
Commercial paper37,894 — 37,894 — 
Agency bonds141,163 — 141,163 — 
Corporate and other debt securities321,166 — 321,166 — 
U.S. government agency securities71,837 — 71,837 — 
Marketable securities572,060 — 572,060 — 
Certificate of deposit included in prepaid expenses and other current assets100 — 100 — 
Certificates of deposit included in other assets, noncurrent2,301 — 2,301 — 
Total financial assets$685,940 $96,486 $589,454 $— 
We classify our highly liquid money market funds within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. We classify our commercial paper, agency bonds, corporate and other debt securities, U.S. government agency securities, treasury bills, and certificates of deposit within Level 2 because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security, which may not be actively traded. We classify the convertible note as Level 3 due to the lack of relevant observable market data over fair value inputs, such as the probability weighting of the various scenarios that can impact settlement of the arrangement.
We hold a non-marketable equity investment in a private company in the business of designing and developing video communications hardware. We do not have a controlling financial interest in the investee nor the ability to exercise significant influence over the operating and financial policies of the investee. We have elected to measure this investment, which does not have a readily determinable fair value, at its cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer (i.e., using the measurement alternative). As of January 31, 2021 and 2020, the carrying amount of the equity investment was $13.5 million and $3.0 million, respectively. We classify the equity investment as Level 3 within the fair value hierarchy only if an impairment or observable adjustment is recognized during the period, as it is based on an observable transaction price at the transaction date and other unobservable inputs, such as volatility.