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Inventories - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | Jun. 28, 2019 | Dec. 28, 2018
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Inventory Disclosure [Abstract] |  |
Raw materials and purchased parts | $ 3,195 | $ 2,678
Work in process | 2,907 | 2,195
Finished goods | 11,621 | 13,214
Total inventories, gross | 17,723 | 18,087
Less inventory reserves | 1,395 | 1,383
Total inventories, net | $ 16,328 | $ 16,704

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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