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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Accounting Policies [Line Items] |  |  |
Advertising expenses | $ 263 | $ 247 | $ 204
Research and development expenses | 2,024 | 1,426 | $ 1,419
Amortization of sales commission | 1,643 |  |
Capitalized balances related to sales commission | $ 473 | $ 1,286 |
The total weighted average number of shares related to the outstanding options excluded from the calculations of diluted earnings per share | 1,467,849 | 573,552 | 1,627,552
Warranty expenses | $ 119 | $ 591 | $ 323
Increase decrease in accumulated deficit | 55 |  |
Bad debt expense | (26) | (376) | 2,231
Contract assets | 23,698 | 47,760 |
Provision for doubtful accounts | $ 2,327 | 3,202 |
Right-of-use leased assets and corresponding liabilities |  | 5,581 |
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 | $ 1,309 | $ 1,303 | $ 1,225
Short-term Debt [Member] |  |  |
Disclosure Of Accounting Policies [Line Items] |  |  |
Restricted cash weighted average interest rate | 1.74% | 2.36% |
Long-term Debt [Member] |  |  |
Disclosure Of Accounting Policies [Line Items] |  |  |
Restricted cash weighted average interest rate | 6.82% | 6.54% |

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