Supplemental Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Accrued payroll, bonuses and related expenses
Accrued payroll	$ 1,589	$ 1,308
Accrued bonuses	1,289	1,774
Accrued payroll taxes	1,023	580
Other	876	587
Employee-related Liabilities, Current	4,777	4,249
Other accrued liabilities
Sales and value-added taxes payable	1,142	889
Other	712	742
Other Accrued Liabilities, Current	$ 1,854	$ 1,631