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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
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.