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MAJOR CUSTOMERS - (Details) - Customer	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue | Verizon Communications Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	17.00%	17.00%	17.00%
Revenue | AT&T Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	12.00%
Accounts receivable
MAJOR CUSTOMERS
Concentration risk, percentage	22.00%	32.00%

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