Stock-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares available for grant	3,500,000
Unrecognized compensation cost	$ 5,600,000
Period for recognition	2 years 8 months 12 days
General and Administrative Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 2,400,000	$ 3,000,000.0	$ 1,700,000
Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted average fair value (in dollars per share)	$ 4.16	$ 5.11	$ 1.74
Exercises in period, intrinsic value	$ 0	$ 400,000	$ 0
Options vested (in shares)	(203,254)	(204,399)	(177,491)
Estimated fair value	$ 1,400,000	$ 1,900,000	$ 800,000
Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock units vested (in shares)	231,161
Estimated fair value	$ 1,100,000
Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Estimated forfeiture rate (percentage)	16.00%
Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Estimated forfeiture rate (percentage)	18.00%
Stock Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option term	10 years
Vesting period	4 years