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SIGNIFICANT ACCOUNTING POLICIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 3,836 $ 3,410
Less: Payments made during the year (1,653) (1,551)
Add: Warranty provision for the current year 2,074 1,863
Changes to warranty provision for prior years (852) 114
Balance at end of year $ 3,405 $ 3,836