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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of unvested stock options, net of unvested forfeitures $ 102,000 $ 200,000 $ 102,000 $ 200,000  
Share price (in dollars per share) $ 0.58   $ 0.58    
The total intrinsic value of options exercised     $ 0 0  
Total cash received from employees as a result of employee stock option exercises     3,600 0  
Total stock-based compensation $ 791,000 $ 479,000 $ 1,742,000 $ 911,000  
Weighted average estimated fair value (in dollars per share) $ 1.04   $ 1.04   $ 1.23
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted in period 0 0 0 0  
Total stock-based compensation $ 24,000 $ 34,000 $ 49,000 $ 72,000  
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, weighted average period     2 years 7 months 2 days    
Unrecognized compensation expense $ 0   $ 0    
Common Stock are available for grants 873,000   873,000    
Stock-based compensation expense $ 11,000 $ 63,000 $ 60,000 $ 117,000  
Weighted average estimated fair value (in dollars per share) $ 0.31 $ 0.47 $ 0.31 $ 0.47  
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation $ 756,000 $ 382,000 $ 1,600,000 $ 722,000  
Unrecognized compensation expense $ 3,100,000 $ 2,300,000 $ 3,100,000 $ 2,300,000  
Unrecognized stock-based compensation expense weighted average period     1 year 9 months 3 days