BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Activity in the allowance for doubtful accounts
Beginning balance	$ 506	$ 382
Additional reserves	803	174
Writeoffs	(107)	(44)
Effect of foreign currency translation	(10)	(6)
Ending balance	1,192	506
Inventories
Parts and raw materials	89,100	65,223
Work-in-process	11,686	9,529
Finished goods	16,322	14,981
Inventories	$ 117,108	$ 89,733