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SIGNIFICANT ACCOUNTING POLICIES - Analysis of warranty accruals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 3,405 $ 3,836
Less: Payments made during the year (2,856) (1,653)
Add: Warranty provision for the current year 3,527 2,074
Changes to warranty provision for prior years 553 (852)
Balance at end of year $ 4,629 $ 3,405