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Business Segments and Geographical Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 10,243 | $ 10,865 | $ 10,002 | $ 10,483 | $ 12,530 | $ 9,789 | $ 11,908 | $ 11,931 | $ 41,593 | $ 46,158 | $ 41,757
United States |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 23,017 | 25,171 | 23,952
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 8,097 | 9,567 | 7,968
Rest of Americas |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,319 | 2,800 | 2,676
Asia/Pacific Rim |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 8,160 | $ 8,620 | $ 7,161

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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