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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Activity in the allowance for doubtful accounts      
Beginning balance $ 341 $ 362 $ 611
Additional reserves 192 39 167
Writeoffs   (61) (414)
Effect of foreign currency translation (3) 1 (2)
Ending balance 530 341 $ 362
Inventories      
Parts and raw materials 34,449 20,509  
Work-in-process 7,557 5,984  
Finished goods 12,965 6,075  
Inventories $ 54,971 $ 32,568