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MAJOR CUSTOMERS (Details) - Customer	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue | Verizon Communications Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	16.00%	15.00%	15.00%	17.00%
Revenue | AT&T Inc.
MAJOR CUSTOMERS
Concentration risk, percentage		16.00%		12.00%
Accounts receivable balance
MAJOR CUSTOMERS
Concentration risk, percentage			15.00%		22.00%

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