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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Activity in the allowance for doubtful accounts |  |
Beginning balance | $ 1,192 | $ 506
Additional reserves | 267 | 803
Writeoffs | (225) | (107)
Effect of foreign currency translation | 6 | (10)
Ending balance | 1,240 | 1,192
Inventories |  |
Parts and raw materials | 87,381 | 89,100
Work-in-process | 11,456 | 11,686
Finished goods | 18,849 | 16,322
Inventories | $ 117,686 | $ 117,108

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