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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Geographic Areas (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Geographic And Sales [Line Items]        
Total net sales $ 35,194 $ 39,664 $ 70,381 $ 72,247
Geographic Distribution, Domestic [Member]        
Geographic And Sales [Line Items]        
Total net sales 882 2,114 2,621 4,066
Geographic Distribution, Foreign [Member]        
Geographic And Sales [Line Items]        
Total net sales 34,312 37,550 67,760 68,181
Geographic Distribution, Foreign [Member] | China [Member]        
Geographic And Sales [Line Items]        
Total net sales 18,603 19,394 30,318 31,165
Geographic Distribution, Foreign [Member] | JAPAN        
Geographic And Sales [Line Items]        
Total net sales 7,463 6,275 15,765 11,794
Geographic Distribution, Foreign [Member] | Other [Member]        
Geographic And Sales [Line Items]        
Total net sales [1] $ 8,246 $ 11,881 $ 21,677 $ 25,222
[1] No other location individually exceeds 10% of the total sales.