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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2012
INVENTORIES [Abstract]  
Schedule of Inventory
    December 31,  
(U.S. dollars in thousands)   2011     2012  
Raw materials   $ 279     $ 2,118  
Work in progress             192  
Finished goods             1,729  
Total inventory   $ 279     $ 4,039