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Stock-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Dec. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Balance outstanding $ 0   $ 0    
Share price (in dollars per share) $ 3.16   $ 3.16    
The total intrinsic value of options exercised     $ 0 $ 0  
Total cash received from employees as a result of employee stock option exercises     0 3,600  
Total stock-based compensation $ 741,000 $ 791,000 343,000 $ 1,742,000  
Fair value of unvested stock options, net of unvested forfeitures $ 11,000   $ 11,000    
Weighted average estimated fair value (in dollars per share) $ 7.99   $ 7.99   $ 12.55
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 $ 14,000 $ 24,000 $ 28,000 $ 49,000  
Unrecognized stock-based compensation expense weighted average period     2 months 12 days    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation 719,000 756,000 $ 306,000 1,600,000  
Unrecognized stock-based compensation expense weighted average period     1 year    
Unrecognized compensation expense 1,700,000 3,100,000 $ 1,700,000 3,100,000  
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense weighted average period     4 months 21 days    
Unrecognized compensation expense $ 25,000   $ 25,000    
Common Stock are available for grants 362,335   362,335    
Stock-based compensation expense $ 8,000 $ 11,000 $ 8,000 $ 60,000  
Weighted average estimated fair value (in dollars per share) $ 1.83 $ 0.31 $ 1.83 $ 0.31