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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% |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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