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PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2012
PROPERTY AND EQUIPMENT [Abstract]  
Schedule of Property and Equipment
    December 31,  
(U.S. dollars in thousands)   2011     2012  
Laboratory equipment   $ 13,079     $ 14,502  
Furniture and computer equipment     1,522       1,818  
Leasehold improvements     13,705       14,447  
Equipment under construction     1,113       329  
    $ 29,419     $ 31,096  
                 
Less - accumulated depreciation and amortization     (11,148 )     (14,786 )
    $ 18,271     $ 16,310