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Geographic and Product Data (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Geographic And Sales [Line Items]    
Net sales $ 20,350 $ 19,269
Japan [Member]    
Geographic And Sales [Line Items]    
Net sales 3,799 4,240
China [Member]    
Geographic And Sales [Line Items]    
Net sales 4,463 3,078
United States [Member]    
Geographic And Sales [Line Items]    
Net sales 1,958 2,516
Korea [Member]    
Geographic And Sales [Line Items]    
Net sales 1,426 2,023
Other [Member]    
Geographic And Sales [Line Items]    
Net sales $ 8,704 $ 7,412