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Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Total revenues | $ 10,426 | $ 10,304 | $ 21,021 | $ 19,813
United States |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Total revenues | 5,327 | 5,114 | 10,529 | 9,974
Europe |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Total revenues | 2,587 | 2,226 | 5,064 | 4,660
Rest of Americas |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Total revenues | 754 | 656 | 1,372 | 1,308
Asia/Pacific Rim |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Total revenues | $ 1,758 | $ 2,308 | $ 4,056 | $ 3,871

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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