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CUSTOMERS, GEOGRAPHIC AND SEGMENT INFORMATION (Schedule of Financial Data for Reportable Operating Segments) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]      
Revenue $ 101,636 $ 85,988 $ 122,000
Cost of revenue 72,564 67,514  
Gross profit (loss) 29,072 18,474  
Research and development, net 15,660 13,301  
Selling and marketing 10,468 8,650  
General and administrative 6,938 7,791  
Merger, acquisition and related litigation expenses, net 2,951  
Operating profit (loss) (3,994) (14,219)  
Financial expenses, net 757 1,429  
Loss before taxes (4,751) (15,648)  
Taxes on income 474 332  
Net loss (5,225) (15,980)  
Depreciation and amortization Expenses 4,646 5,271  
Fixed Networks [Member]      
Segment Reporting Information [Line Items]      
Revenue 56,127 44,790  
Cost of revenue 35,723 32,254  
Gross profit (loss) 20,404 12,536  
Research and development, net 4,700 4,180  
Selling and marketing 7,639 6,326  
General and administrative 3,931 4,842  
Merger, acquisition and related litigation expenses, net    
Operating profit (loss) 4,134 (2,812)  
Depreciation and amortization Expenses 2,379 3,170  
Mobility Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenue 31,002 33,207  
Cost of revenue 20,746 23,427  
Gross profit (loss) 10,256 9,780  
Research and development, net 10,960 9,121  
Selling and marketing 2,810 2,304  
General and administrative 2,302 2,185  
Merger, acquisition and related litigation expenses, net    
Operating profit (loss) (5,816) (3,830)  
Depreciation and amortization Expenses 2,236 2,061  
Terrestrial Infrastructure Projects [Member]      
Segment Reporting Information [Line Items]      
Revenue 14,507 7,991  
Cost of revenue 16,095 11,833  
Gross profit (loss) (1,588) (3,842)  
Research and development, net  
Selling and marketing 19 20  
General and administrative 705 764  
Merger, acquisition and related litigation expenses, net    
Operating profit (loss) (2,312) (4,626)  
Depreciation and amortization Expenses $ 31 $ 40