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COMMITMENTS AND CONTINGENT LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum annual lease commitments

​ ​ ​
U.S. dollars 
in thousands
 ​
Years ending December 31: ​ ​
2016
 ​ ​ ​ ​ 3,263 ​ ​
2017
 ​ ​ ​ ​ 3,036 ​ ​
2018
 ​ ​ ​ ​ 2,774 ​ ​
2019
 ​ ​ ​ ​ 444 ​ ​
​ ​ ​ ​ ​ 9,517 ​ ​
​