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SIGNIFICANT ACCOUNTING POLICIES - Analysis of warranty accruals (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 5,373 $ 4,629
Less: Payments made during the year (3,944) (2,599)
Add: Warranty provision for the current year 3,901 3,436
Changes to warranty provision for prior years 277 (93)
Balance at end of year $ 5,607 $ 5,373