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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Activity in the allowance for doubtful accounts    
Beginning balance $ 382 $ 405
Additional reserves 174 91
Writeoffs (44) (123)
Effect of foreign currency translation (6) 9
Ending balance 506 382
Inventories    
Parts and raw materials 65,223 44,750
Work-in-process 9,529 6,186
Finished goods 14,981 12,042
Inventories $ 89,733 $ 62,978