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INVENTORIES
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
INVENTORIES
NOTE 5   INVENTORIES
Inventories are composed of the following:
​ ​ ​
December 31,
 ​
​ ​ ​
2014
 ​ ​
2013
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Raw materials
 ​ ​ ​ ​ 2,070 ​ ​ ​ ​ ​ 2,387 ​ ​
Work in process
 ​ ​ ​ ​ 9 ​ ​ ​ ​ ​ 282 ​ ​
Finished goods and spare parts
 ​ ​ ​ ​ 15,547 ​ ​ ​ ​ ​ 8,685 ​ ​
Total
 ​ ​ ​ ​ 17,626 ​ ​ ​ ​ ​ 11,354 ​ ​
​
Inventory of  $156 thousand, $23 thousand and $231 thousand was written down, as a component of cost of revenues, in the years ended December 31, 2014, 2013 and 2012, respectively.