(10) Concentration of Credit Risk, Significant Customers and Geographic Information - Revenue derived from the following countries by geographic area (Details)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Percent of Total Revenues
United States of America	33.00%	30.00%
Germany	53.00%	42.00%
Other	14.00%	28.00%