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Concentration of Risks and Significant Customers
12 Months Ended
Dec. 31, 2022
Risks and Uncertainties [Abstract]  
Concentration of Risks and Significant Customers Concentration Risks and Significant Customers
Financial instruments that potentially expose the Company to concentration of credit risk consist of cash and cash equivalents, marketable securities, accounts receivable and unbilled customers' receivable, or collectively, customers' receivables, and settlements receivable. Cash on deposit with financial institutions may, at times, exceed federally insured limits. Management believes that these financial institutions are financially sound and, accordingly, minimal credit risk exists. Cash and cash equivalents as of December 31, 2022 and December 31, 2021 included $0.5 billion and $1.2 billion, respectively, of investments in three money market mutual funds which invest primarily in U.S. treasury securities and U.S. agency securities.
As of December 31, 2022, marketable securities were $440.9 million, and there was no concentration of securities of the same issuer with an aggregate fair value greater than 5% of this total balance, except for U.S. Treasuries and U.S. Agency Securities, which amounted to $407.1 million, or 92% of the marketable securities. All debt securities within the Company's marketable securities portfolio are investment grade.
As of December 31, 2021, marketable securities were $452.9 million, and there was no concentration of securities of the same issuer with an aggregate fair value greater than 5% of the total balance, except for U.S. Treasuries, which amounted to $418.3 million, or 92% of the marketable securities.
A significant portion of the Company's payment transactions is settled through one Issuing Bank, Sutton Bank. For the years ended December 31, 2022, 2021 and 2020, 82%, 90% and 96% of Total Processing Volume, which is the total dollar amount of payments processed through the Company’s platform, net of returns and chargebacks, was settled through Sutton Bank, respectively.
For each significant customer, net revenue as a percentage of total net revenue and customers' receivables as a percentage of total customers' receivables are as follows:
Percent of Net Revenue
for the Year Ended December 31,
202220212020
Customer A71%69%70%
Percent of Customers' Receivables as of December 31,
20222021
Customer B18%*
Customer C*20%
Customer D*13%
* Less than 10%