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RELATED PARTY BALANCES AND TRANSACTIONS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Amount of surveys services |  | $ 900 | $ 490
Revenues | $ 5,843 | $ 6,745 | 3,336
Compass Networks [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash consideration |  |  | $ 833
Percentage of acquisitions |  | 11.00% | 14.00%
Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Reimbursements for services provided | 1,801 | $ 2,242 | $ 1,856
Fitel [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues | 5,594 |  |
Inventories [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 83 | 152 | 78
Purchase Of Property And Equpment [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 274 | 46 | 148
Purchase Of Property And Equpment [Member] | Rad Bynet [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | 274 | 46 | 148
Rent And Maintenance [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses | $ 2,099 | $ 1,936 | $ 1,960

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