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Stock-Based Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 01, 2019
Jan. 02, 2018
Jan. 03, 2017
Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Number of shares available for grant 3,500,000      
Unrecognized compensation cost $ 6,700,000      
Period for recognition 2 years 9 months      
Risk-free interest rate 2.70% 2.00% 1.20%  
Expected term (average in years) 6 years 2 months 12 days 6 years 1 month 6 days 5 years  
Expected dividend yield 0.00% 0.00% 0.00%  
Expected volatility 51.00% 39.60% 37.00%  
Employee Stock Purchase Plan [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Number of shares authorized       750,000
Stock based compensation expense $ 36,000      
General and Administrative Expense [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation expense $ 3,000,000.0 $ 1,700,000 $ 2,500,000  
2010 Stock Incentive Plan Post-Merger [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock option term 10 years      
Vesting period 4 years      
Capitalized Internal Costs [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation expense $ 47,000 178,000 222,000  
Stock Option [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Exercises in period, intrinsic value $ 400,000 $ 0 $ 200,000  
Vested (in shares) (204,399) (177,491) (271,457)  
Estimated fair value $ 1,900,000 $ 800,000 $ 2,700,000  
Weighted average fair value (in dollars per share) $ 5.11 $ 1.74 $ 2.85  
Restricted Stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Vested Options, Vested in Period 197,384      
Estimated fair value $ 2,200,000      
Granted (in shares) 824,251      
Kevin Reddy [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation expense     $ 700,000  
Minimum        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Estimated forfeiture rate (percentage) 0.00%      
Maximum        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Estimated forfeiture rate (percentage) 17.00%