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WARRANTY OBLIGATIONS (Tables)
 6 Months Ended
Jun. 30, 2019
Product Warranties Disclosures [Abstract]  
Schedule of Warranty Obligations
Changes in the Company’s product warranty obligations for the six months ended June 30, 2019 (unaudited) and 2018 (unaudited) were as follows:

   
Six months ended June 30,
  
   
2019
    
2018
  
   
(unaudited)
  
             
Balance, at beginning of period
  
$
121,826
    
$
78,811
  
Additions and adjustments to cost of revenues
    
46,288
      
27,546
  
Usage and current warranty expenses
    
(17,476
)
    
(9,066
)
                 
Balance at end of period
    
150,638
      
97,291
  
Less current portion
    
(38,819
)
    
(18,964
)
                 
Long term portion
  
$
111,819
    
$
78,327