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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Activity in the allowance for doubtful accounts |  |  |
Beginning balance | $ 611 | $ 367 | $ 802
Additional reserves | 167 | 333 | 473
Writeoffs | (414) | (117) | (882)
Effect of foreign currency translation | (2) | 28 | (26)
Ending balance | 362 | 611 | 367
Inventories |  |  |
Parts and raw materials | 23,978 | 23,710 |
Work-in-process | 6,628 | 2,404 |
Finished goods | 4,928 | 3,730 |
Inventory, gross | 35,534 | 29,844 |
Less reserves | (4,436) | (3,669) |
Inventories | 31,098 | 26,175 |
Provision for excess and obsolete inventory | $ 351 | $ 432 | $ 753

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