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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Accounting Policies [Line Items] |  |  |
Goodwill impairment losses |  |  | $ 20,402
Period of projected net cash flows |  |  | 5 years
Long-term growth rate |  |  | 4.00%
Discount rate |  |  | 13.00%
Shipping expenses | 1,225 | 1,367 | $ 976
Advertising expenses | 204 | 243 | 181
Research and development expenses | 1,419 | 1,624 | $ 2,540
Restricted cash held by trustees | $ 4,325 | $ 9,058 |
The total weighted average number of shares related to the outstanding options excluded from the calculations of diluted loss per share | 1,627,552 | 2,227,150 | 3,925,236
Impairment of long lived assets |  |  | $ 10,137
Warranty expenses | 323 | 704 | 864
Impairment loss of property and equipment, net |  |  | 4,106
Long-term deferred charges |  |  | 6,031
Restructuring costs for one-time employee termination benefits |  |  | 367
Costs to terminate a manufacturing contract |  |  | 1,141
Increase decrease in accumulated deficit | 55 |  |
Bad debt expense | 2,231 | $ 6,222 | $ 1,369
Cumulative effect to retained earnings | $ 1,500 |  |
Short-term Debt [Member] |  |  |
Disclosure Of Accounting Policies [Line Items] |  |  |
Restricted cash weighted average interest rate | 1.23% | 0.36% |
Long-term Debt [Member] |  |  |
Disclosure Of Accounting Policies [Line Items] |  |  |
Restricted cash weighted average interest rate | 7.94% | 5.89% |

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