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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Activity in the allowance for doubtful accounts      
Beginning balance $ 530 $ 341  
Additional reserves (5) 192 $ 39
Writeoffs (132)    
Effect of foreign currency translation 12 (3)  
Ending balance 405 530 $ 341
Inventories      
Parts and raw materials 35,849 34,449  
Work-in-process 6,951 7,557  
Finished goods 10,585 12,965  
Inventories $ 53,385 $ 54,971