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Cash Equivalents and Marketable Securities
3 Months Ended
Apr. 30, 2020
Cash and Cash Equivalents [Abstract]  
Cash Equivalents and Marketable Securities Cash Equivalents and Marketable Securities
The following are the fair values of our cash equivalents and marketable securities as of April 30, 2020 (in thousands):
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Estimated
Fair Value
Cash equivalents:
Money market funds
$88,990  $—  $—  $88,990  
Marketable securities:
Asset-backed securities
38,823  338  —  39,161  
Corporate notes and obligations
197,496  1,454  (26) 198,924  
Commercial paper
51,093  22  (3) 51,112  
Municipal securities
12,855  134  (7) 12,982  
Certificates of deposit
29,997  44  (48) 29,993  
U.S. treasury securities
22,035  194  —  22,229  
Total cash equivalents and marketable securities
$441,289  $2,186  $(84) $443,391  

The following are the fair values of our cash equivalents and marketable securities as of January 31, 2020 (in thousands):
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Estimated
Fair Value
Cash equivalents:
Money market funds
$34,596  $—  $—  $34,596  
Marketable securities:
Asset-backed securities
68,194  235  —  68,429  
Corporate notes and obligations
199,226  891  —  200,117  
Commercial paper
46,460   —  46,467  
Municipal securities
20,865  65  —  20,930  
Certificates of deposit
14,996  19  —  15,015  
U.S. treasury securities
24,563  33  —  24,596  
Total cash equivalents and marketable securities
$408,900  $1,250  $—  $410,150  
The contractual maturities of investments in available-for-sale securities were as follows (in thousands):
April 30, 2020January 31, 2020
Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due within one year$341,399  $342,437  $273,582  $274,058  
Due after one year through five years99,890  100,954  135,318  136,092  
Total investments in marketable securities$441,289  $443,391  $408,900  $410,150  
The unrealized loss for each of these fixed rate marketable securities was not material as of April 30, 2020 and January 31, 2020. The unrealized losses on these investments were primarily due to changes in market interest rates. We expect to receive the full principal and interest on all of these marketable securities and have the ability and intent to hold these investments until a recovery of fair value. We determined that no allowance for credit losses was required for the three months ended April 30, 2020 and 2019.
Realized gains and realized losses on our cash equivalents and marketable securities are included in other income (expense), net on the condensed consolidated statement of operations and were not material for the three months ended April 30, 2020 and 2019.
Reclassification adjustments out of accumulated other comprehensive income into net loss were not material for the three months ended April 30, 2020 and 2019.