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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Accounting Policies [Line Items]      
Advertising expenses $ 128 $ 263 $ 247
Research and development expenses 1,386 2,024 $ 1,426
Amortization of sales commission 1,705    
Capitalized balances related to sales commission $ 2,277 $ 1,759  
The total weighted average number of shares related to the outstanding options excluded from the calculations of diluted earnings per share 1,685,386 1,467,849 573,552
Warranty expenses $ 49 $ 207 $ 738
Bad debt income 3 26 376
Provision for doubtful accounts 1,933 2,327  
Warranty provisions amount 1,594 1,867  
Right-of-use leased assets and corresponding liabilities     5,581
Allowance of credit losses $ 1,933 2,327  
Network equipment [Member] | Minimum [Member]      
Disclosure Of Accounting Policies [Line Items]      
Property and equipment, estimated useful life 2 years    
Network equipment [Member] | Maximum [Member]      
Disclosure Of Accounting Policies [Line Items]      
Property and equipment, estimated useful life 5 years    
Shipping Expenses [Member]      
Disclosure Of Accounting Policies [Line Items]      
Shipping expenses $ 1,227 $ 1,309 $ 1,303
Short-term Debt [Member]      
Disclosure Of Accounting Policies [Line Items]      
Restricted cash weighted average interest rate 0.21% 1.74%  
Long-term Debt [Member]      
Disclosure Of Accounting Policies [Line Items]      
Restricted cash weighted average interest rate 6.41% 6.82%