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FINANCIAL INCOME (EXPENSES), NET (Tables)
 12 Months Ended
Dec. 31, 2015
Financial Income (Expenses), Net [Abstract]  
Schedule of net of financial income(expence)

​ ​ ​
Year ended December 31,
 ​
​ ​ ​
2015
 ​ ​
2014
 ​ ​
2013
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Financial income (expenses), net
 ​ ​ ​ ​
Foreign currency gains (losses), net
 ​ ​ ​ ​ (185) ​ ​ ​ ​ ​ (3,104) ​ ​ ​ ​ ​ 1,972 ​ ​
Bank charges
 ​ ​ ​ ​ (421) ​ ​ ​ ​ ​ (199) ​ ​ ​ ​ ​ (117) ​ ​
Loss from sales of marketable securities
 ​ ​ ​ ​ (311) ​ ​ ​ ​ ​ (1,139) ​ ​ ​ ​ ​ (466) ​ ​
​ ​ ​ ​ ​ (917) ​ ​ ​ ​ ​ (4,442) ​ ​ ​ ​ ​ 1,389 ​ ​
​