Employee Benefit Plans (Details) - USD ($)	12 Months Ended				55 Months Ended
	Jan. 02, 2018	Jan. 03, 2017	Dec. 29, 2015	Dec. 31, 2013	Jan. 02, 2018
Multiemployer Plans [Line Items]
Required employee age	21 years
Percentage of participants contributions vested	100.00%
Contributions by employer	$ 0	$ 0	$ 0
Weighted-average fair value per share at date of grant	$ 1.74	$ 2.85	$ 5.04
Employee Stock Purchase Plan [Member]
Multiemployer Plans [Line Items]
Maximum employee salary percentage				15.00%
Offering date percentage				85.00%
Purchase date percentage				85.00%
Number of shares authorized				750,000
Shares issued	37,069				117,381
Reserved for future issuance	632,619				632,619
Risk free interest rate	1.07%
Expected life	3 months
Expected volatility rate	38.30%
Expected dividend rate	0.00%
Weighted-average fair value per share at date of grant	$ 0.77
Employee stock purchase plan, compensation expense	$ 29,000
Other long-term liabilities
Multiemployer Plans [Line Items]
Deferred compensation plan liability	1,300,000	$ 1,500,000			$ 1,300,000
Other Assets [Member]
Multiemployer Plans [Line Items]
Deferred compensation plan asset	$ 1,900,000	$ 1,600,000			$ 1,900,000