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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 |

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