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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
VALUATION AND QUALIFYING ACCOUNTS
NOTE 13   VALUATION AND QUALIFYING ACCOUNTS
​ ​ ​
Warranty
provision
 ​ ​
Allowance for
doubtful accounts
 ​ ​
Valuation allowance
for deferred
tax assets
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Balance, as of December 31, 2011
 ​ ​ ​ ​ 243 ​ ​ ​ ​ ​ 25 ​ ​ ​ ​ ​ 9,936 ​ ​
Additions
 ​ ​ ​ ​ 49 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 94 ​ ​
Deductions
 ​ ​ ​ ​ (33) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (4,180) ​ ​
Balance, as of December 31, 2012
 ​ ​ ​ ​ 259 ​ ​ ​ ​ ​ 25 ​ ​ ​ ​ ​ 5,850 ​ ​
Additions
 ​ ​ ​ ​ 136 ​ ​ ​ ​ ​ 25 ​ ​ ​ ​ ​ — ​ ​
Deductions
 ​ ​ ​ ​ (88) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (5,850) ​ ​
Balance, as of December 31, 2013
 ​ ​ ​ ​ 307 ​ ​ ​ ​ ​ 50 ​ ​ ​ ​ ​ — ​ ​
Additions
 ​ ​ ​ ​ 261 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Deductions
 ​ ​ ​ ​ (98) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Balance, as of December 31, 2014
 ​ ​ ​ ​ 470 ​ ​ ​ ​ ​ 50 ​ ​ ​ ​ ​ — ​ ​
​