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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Accounting Policies [Line Items]      
Goodwill impairment losses $ 20,402
Period of projected net cash flows   5 years  
Discount rate   13.00%  
Long-term growth rate   4.00%  
Shipping expenses 1,367 $ 976 2,685
Advertising expenses 243 181 273
Research and development expenses 1,624 2,540 $ 2,477
Restricted cash held by trustees $ 9,058 $ 8,524  
The total weighted average number of shares related to the outstanding options excluded from the calculations of diluted loss per share 2,227,150 3,925,236 5,546,082
Impairment of long lived assets $ 10,137
Warranty expenses $ 704 864 $ 361
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  
Short-term Debt [Member]      
Disclosure Of Accounting Policies [Line Items]      
Restricted cash weighted average interest rate 0.36% 0.19%  
Long-term Debt [Member]      
Disclosure Of Accounting Policies [Line Items]      
Restricted cash weighted average interest rate 5.89% 5.84%