Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 2018	Dec. 29, 2018
Operating ROU assets	$ 1,378	$ 1,300
Noncurrent operating lease liabilities	892
Total operating lease liabilities	1,390	$ 1,300
Right of Use Asset [Member]
Operating ROU assets	1,378
Other Current Liabilities [Member]
Current operating lease liabilities	498
Long Term Leases [Member]
Noncurrent operating lease liabilities	$ 892