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WARRANTY OBLIGATIONS
 12 Months Ended
Dec. 31, 2018
Product Warranties Disclosures [Abstract]  
WARRANTY OBLIGATIONS
NOTE 12:-
  WARRANTY OBLIGATIONS

Changes in the Company’s product warranty obligations for the years ended December 31, 2018, 2017 and 2016, were as follows:
 
   
December 31,
  
   
2018
    
2017
    
2016
  
                   
Balance, at beginning of year
  
$
78,811
    
$
58,375
    
$
51,192
  
Additions and adjustments to cost of revenues
    
70,854
      
34,650
      
13,749
  
Usage and current warranty expenses
    
(27,839
)
    
(14,214
)
    
(6,566
)
                         
Balance, at end of year
    
121,826
      
78,811
      
58,375
  
Less current portion
    
(28,868
)
    
(14,785
)
    
(13,616
)
                         
Long term portion
  
$
92,958
    
$
64,026
    
$
44,759