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Disaggregation of Revenues, Geographic Sales and Product Sales - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  | $ 31,186 | $ 31,770 | $ 33,905 | $ 27,093 | $ 24,852 | $ 23,473 | $ 21,936 | $ 20,350 | $ 123,954 | $ 90,611 | $ 82,432
Geographic Distribution, Domestic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 7,316 | 7,894 | 9,859
Geographic Distribution, Foreign [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 116,638 | 82,717 | 72,573
China [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [1] |  |  |  |  |  |  |  |  | 46,070 | 24,473 | 16,624
JAPAN |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 23,151 | 18,125 | 17,327
US |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 7,316 | 7,894 | 9,859
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic And Sales [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [2] |  |  |  |  |  |  |  |  | $ 47,417 | $ 40,119 | $ 38,622
[1] | Starting in fiscal 2018, the China region includes sales into China and Hong Kong. Sales for fiscal 2017 and 2016, also reflect sales into Hong Kong so as to be comparable to 2018 presentation, where previously Hong Kong sales were included in the other line item.
[2] | No other location individually exceeds 10% of the total net sales.

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- Definition Geographic And Sales [Line Items] + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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