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INVESTMENTS IN DEBT SECURITIES
3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS IN DEBT SECURITIES INVESTMENTS IN DEBT SECURITIES
The Company's short-term and long-term investments as of March 31, 2024 were as follows (in thousands):
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Short-term debt securities:
U.S. agency securities$58,399 $— $(676)$57,723 
Corporate bonds135,097 60 (626)134,531 
Commercial paper724 — — 724 
Municipal securities9,391 — (138)9,253 
Certificates of deposit500 — — 500 
U.S. government securities372,337 43 (2,317)370,063 
Foreign government securities600 — (4)596 
Total$577,048 $103 $(3,761)$573,390 
Long-term debt securities:
Corporate bonds$96,206 $273 $(95)$96,384 
Municipal securities2,481 30 (119)2,392 
U.S. government securities89,073 151 (78)89,146 
Total$187,760 $454 $(292)$187,922 

The Company's short-term and long-term investments as of December 31, 2023 were as follows (in thousands):
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Short-term debt securities:
U.S. agency securities$68,778 $— $(1,263)$67,515 
Corporate bonds216,864 96 (1,733)215,227 
Commercial paper15,159 — — 15,159 
Municipal securities9,396 — (231)9,165 
Certificates of deposit3,856 — — 3,856 
U.S. government securities544,145 210 (4,357)539,998 
Foreign government securities1,000 — (19)981 
Total$859,198 $306 $(7,603)$851,901 
Long-term debt securities:
Corporate bonds$94,564 $809 $(45)$95,328 
Municipal securities2,495 55 (138)2,412 
U.S. government securities152,549 875 (37)153,387 
Total$249,608 $1,739 $(220)$251,127 

The amortized cost of investments classified as cash equivalents approximated the fair value due to the short-term nature of the investments.
The Company's gross unrealized losses and fair values for those investments that were in an unrealized loss position as of March 31, 2024 and December 31, 2023, aggregated by investment category and the length of time that individual securities have been in a continuous loss position were as follows (in thousands):
March 31, 2024
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Short-term debt securities:
U.S. agency securities$400 $— $57,322 $(676)$57,722 $(676)
Corporate bonds44,988 (48)52,483 (578)97,471 (626)
Municipal securities— — 9,253 (138)9,253 (138)
U.S. government securities92,760 (78)162,389 (2,239)255,149 (2,317)
Foreign government securities— — 596 (4)596 (4)
Total$138,148 $(126)$282,043 $(3,635)$420,191 $(3,761)
Long-term debt securities:
Corporate bonds$45,907 $(87)$980 $(8)$46,887 $(95)
Municipal securities977 (13)385 (106)1,362 (119)
U.S. government securities25,758 (78)— — 25,758 (78)
Total$72,642 $(178)$1,365 $(114)$74,007 $(292)

December 31, 2023
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Short-term debt securities:
U.S. agency securities$9,770 $(10)$57,745 $(1,253)$67,515 $(1,263)
Corporate bonds61,054 (60)110,706 (1,673)171,760 (1,733)
Municipal securities— — 9,165 (231)9,165 (231)
U.S. government securities80,724 (113)207,183 (4,243)287,907 (4,356)
Foreign government securities— — 981 (19)981 (19)
Total$151,548 $(183)$385,780 $(7,419)$537,328 $(7,602)
Long-term debt securities:
Corporate bonds$11,819 $(31)$2,274 $(14)$14,093 $(45)
Municipal securities976 (24)383 (112)1,359 (136)
U.S. government securities28,474 (37)— — 28,474 (37)
Total$41,269 $(92)$2,657 $(126)$43,926 $(218)
The Company does not intend to sell nor anticipate that it will be required to sell these securities before recovery of the amortized cost basis. Unrealized losses on available-for-sale debt securities were determined not to be related to credit related losses, therefore, an allowance for credit losses is not required.

The contractual maturities of the Company's short-term and long-term investments as of March 31, 2024 were as follows (in thousands):
Amortized CostFair Value
Due in one year or less$577,048 $573,390 
Due in one to five years187,760 187,922 
Total$764,808 $761,312 
CUSTOMER FUNDS
The following table presents the assets underlying customer funds (in thousands):
  March 31, 2024December 31, 2023
Cash$3,109,317 $2,137,634 
Cash equivalents:
Money market funds4,645 4,042 
Reverse repurchase agreement (i)
932,384 1,028,754 
Total customer funds$4,046,346 $3,170,430 

(i) The Company has accounted for the reverse repurchase agreement with a third party as an overnight lending arrangement, collateralized by the securities subject to the repurchase agreement. The Company classifies the amounts due from the counterparty as cash equivalents due to their short-term nature.

The amortized cost of investments classified as cash equivalents approximated the fair value due to the short-term nature of the investments.