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MAJOR CUSTOMERS
12 Months Ended
Dec. 31, 2022
Risks and Uncertainties [Abstract]  
MAJOR CUSTOMERS MAJOR CUSTOMERS
The following customers contributed 10% or more of the Company's revenue in at least one of the years ended December 31, 2022, 2021 and 2020:
Year ended December 31,
202220212020
Verizon Communications Inc.15%16%15%

At December 31, 2022, no customer accounted for 10% or more of the Company's accounts receivable balance. At December 31, 2021, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 15% of total accounts receivable. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable. The Company maintains an allowance for doubtful accounts and such losses have historically been within management's expectations.