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MAJOR CUSTOMERS
 9 Months Ended
Sep. 30, 2020
Risks and Uncertainties [Abstract]  
MAJOR CUSTOMERS MAJOR CUSTOMERS
The following customers contributed 10% or more of the Company's revenue in the three and nine months ended September 30, 2020 and 2019:
 Three months endedNine months ended
 September 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Verizon Communications Inc.16%15%15%17%
AT&T Inc.*16%*12%

* Represents less than 10% of total revenue.


At September 30, 2020, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 15% of total accounts receivable. At December 31, 2019, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 22% of total accounts receivable. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable, although in some instances the Company may require letters of credit to support customer outstanding accounts receivable balances. The Company maintains an allowance for doubtful accounts and such losses have been within management's expectations.