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Geographic and Product Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | $ 90,611 | $ 82,432 | $ 77,123
Japan [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 17,424 | 17,329 | 16,982
China [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 23,881 | 16,019 | 12,571
United States [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 7,894 | 9,859 | 10,904
Korea [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales |  | 5,543 | 7,455 | 8,061
Other [Member] |  |  |  |
Geographic And Sales [Line Items] |  |  |  |
Net sales | [1] | $ 35,869 | $ 31,770 | $ 28,605
[1] | No other location individually exceeds 10% of total sales.

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