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Fair Value Measurements
9 Months Ended
Oct. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of October 31, 2021 and January 31, 2021 and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):
Fair Value Measurement as of October 31, 2021
Level 1
Level 2
Level 3
Total
Financial Assets:
Cash and cash equivalents:
Money market funds $631,924 $— $— $631,924 
Short-term investments:
U.S. government treasury securities
1,054,746 — — 1,054,746 
Total financial assets
$1,686,670 $— $— $1,686,670 

Fair Value Measurement as of January 31, 2021
Level 1
Level 2
Level 3
Total
Financial Assets:
Cash and cash equivalents:
Money market funds $330,109 $— $— $330,109 
Short-term investments:
U.S. government treasury securities
528,045 — — 528,045 
Total financial assets
$858,154 $— $— $858,154 
The Company utilized the market approach and Level 1 valuation inputs to value its money market mutual funds and U.S. government treasury securities because published net asset values were readily available. The contractual maturity of all marketable securities was less than one year as of October 31, 2021 and January 31, 2021. As of October 31, 2021 and January 31, 2021, gross unrealized gains and losses for cash equivalents and short-term investments were not material. Accordingly, the Company concluded that an allowance for credit losses was unnecessary for short-term investments as of October 31, 2021. Gross realized gains and losses were not material for each of the three- and nine-month periods ended October 31, 2021 and 2020.
Convertible Senior Notes
In addition to its cash, cash equivalents and short-term investments, the Company measures the fair value of its outstanding convertible senior notes on a quarterly basis for disclosure purposes. The Company considers the fair value of its convertible senior notes at October 31, 2021 to be a Level 2 measurement due to limited trading activity of the convertible senior notes. Refer to Note 5, Convertible Senior Notes, for further details.
Non-marketable Securities
As of October 31, 2021 and January 31, 2021, the total amount of non-marketable equity securities included in other assets on the Company’s condensed consolidated balance sheets was $2.8 million and $0.5 million. During the three and nine
months ended October 31, 2021, the Company invested an additional $1.2 million and $2.3 million, respectively, of its cash in non-marketable equity securities. Refer to Note 2, Summary of Significant Accounting Policies, in the Notes to Consolidated Financial Statements included in Part II, Item 8 of the Company’s 2021 Form 10-K for further information. The Company classifies these assets as Level 3 within the fair value hierarchy only if an impairment or observable price changes in orderly transactions are recognized on these non-marketable equity securities during the period. The estimation of fair value for these investments is inherently complex due to the lack of readily available market data and inherent lack of liquidity and requires the Company’s judgment and the use of significant unobservable inputs in an inactive market. In addition, the determination of whether an orderly transaction is for the identical or a similar investment requires significant management judgment, including understanding the differences in the rights and obligations of the investments, the extent to which those differences would affect the fair values of those investments and the stage of operational development of the entities. For the three and nine months ended October 31, 2021, there have been no adjustments to the carrying values of the Company’s non-marketable securities as a result of impairment or observable price changes.