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Disaggregation of Revenues, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 03, 2020
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Dec. 28, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
Geographic And Sales [Line Items]                      
Total net sales $ 38,883 $ 39,055 $ 39,664 $ 32,583 $ 31,186 $ 31,770 $ 33,905 $ 27,093 $ 150,185 $ 123,954 $ 90,611
Geographic Distribution, Domestic [Member]                      
Geographic And Sales [Line Items]                      
Total net sales                 8,106 7,316 7,894
Geographic Distribution, Foreign [Member]                      
Geographic And Sales [Line Items]                      
Total net sales                 142,079 116,638 82,717
Geographic Distribution, Foreign [Member] | China [Member]                      
Geographic And Sales [Line Items]                      
Total net sales [1]                 64,820 46,070 24,473
Geographic Distribution, Foreign [Member] | JAPAN                      
Geographic And Sales [Line Items]                      
Total net sales                 26,881 23,151 18,125
Geographic Distribution, Foreign [Member] | Other [Member]                      
Geographic And Sales [Line Items]                      
Total net sales [2]                 $ 50,378 $ 47,417 $ 40,119
[1] The China region includes sales into China and Hong Kong.
[2] No other location individually exceeds 10% of the total net sales.