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INVENTORIES
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
INVENTORIES
NOTE 5   INVENTORIES
Inventories are comprised of the following:
​ ​ ​
December 31,
 ​
​ ​ ​
2015
 ​ ​
2014
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Raw materials
 ​ ​ ​ ​ 3,566 ​ ​ ​ ​ ​ 2,070 ​ ​
Work in process
 ​ ​ ​ ​ 1,134 ​ ​ ​ ​ ​ 9 ​ ​
Finished goods and spare parts
 ​ ​ ​ ​ 37,976 ​ ​ ​ ​ ​ 15,547 ​ ​
Total
 ​ ​ ​ ​ 42,676 ​ ​ ​ ​ ​ 17,626 ​ ​
​
Inventory of  $646 thousand, $156 thousand and $23 thousand was written down, as a component of cost of revenues, in the years ended December 31, 2015, 2014 and 2013, respectively.