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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2017
INVENTORIES [Abstract]  
Schedule of Inventory
Inventories at December 31, 2016 and 2017 consisted of the following:
 
 
 
December 31,
 
(U.S. dollars in thousands)
 
2016
 
2017
 
Raw materials
 
$
2,591
 
$
3,838
 
Work in progress
 
 
395
 
 
485
 
Finished goods
 
 
2,259
 
 
3,510
 
Total inventory
 
$
5,245
 
$
7,833