For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

MAJOR CUSTOMERS (Details) - Customer	3 Months Ended		12 Months Ended
MAJOR CUSTOMERS (Details) - Customer	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue \| Verizon Communications Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	13.00%	15.00%
Revenue \| AT&T Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	10.00%	10.00%
Accounts receivable balance
MAJOR CUSTOMERS
Concentration risk, percentage			22.00%