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INVENTORIES
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
INVENTORIES
NOTE 5   INVENTORIES
Inventories are comprised of the following:
​ ​ ​
December 31,
 ​
​ ​ ​
2016
 ​ ​
2015
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Raw materials
 ​ ​ ​ ​ 6,873 ​ ​ ​ ​ ​ 3,566 ​ ​
Work in process
 ​ ​ ​ ​ 1,175 ​ ​ ​ ​ ​ 1,134 ​ ​
Finished goods and spare parts
 ​ ​ ​ ​ 48,968 ​ ​ ​ ​ ​ 37,976 ​ ​
Total
 ​ ​ ​ ​ 57,016 ​ ​ ​ ​ ​ 42,676
Inventory of  $318 thousand, $646 thousand and $156 thousand was written down, as a component of cost of revenues, in the years ended December 31, 2016, 2015 and 2014, respectively.