Operating Leases (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Leases [Abstract]
Right-of-use assets	$ 10,858	$ 12,310
Current lease liabilities	3,258	3,155
Non-current lease liabilities	7,775	9,312
Total lease liabilities	$ 11,033	$ 12,467
Weighted average remaining lease term (in years):	5 years 3 months 18 days
Weighted average discount rate:	4.80%