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(10) Concentration of Credit Risk, Significant Customers and Geographic Information (Tables)
12 Months Ended
Dec. 29, 2018
Risks and Uncertainties [Abstract]  
Significant Customer
   Percent of Total Revenues
Significant Customer  2018  2017
A   36%   28%
B   17%   14%
C   12%   9%
D   <10%   <10%
Revenue derived from the following countries by geographic area
   Percent of Total Revenues
Country  2018  2017
United States of America   33%   30%
Germany   53%   42%
Other   14%   28%