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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Loss
  Retained Earnings
  Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Balance (in shares) at Dec. 28, 2018     29,968,483        
Balance at Dec. 28, 2018 $ 308,676 $ (2,027) $ 300 $ 207,326 $ (2,221) $ 103,271 $ (2,027)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income 1,134         1,134  
Stock compensation (in shares)     (23,680)        
Stock compensation 915     915      
Exercise of stock options (in shares)     20,383        
Exercise of stock options 412     412      
Cumulative translation adjustment 55       55    
Shares surrendered to pay withholding taxes (in shares)     (24,002)        
Shares surrendered to pay tax withholding (742)     (742)      
Balance (in shares) at Mar. 29, 2019     29,941,184        
Balance at Mar. 29, 2019 308,423   $ 300 207,911 (2,166) 102,378  
Balance (in shares) at Dec. 28, 2018     29,968,483        
Balance at Dec. 28, 2018 308,676 $ (2,027) $ 300 207,326 (2,221) 103,271 $ (2,027)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income 8,880            
Cumulative translation adjustment 173            
Balance (in shares) at Jun. 28, 2019     30,291,364        
Balance at Jun. 28, 2019 317,395   $ 303 209,016 (2,048) 110,124  
Balance (in shares) at Mar. 29, 2019     29,941,184        
Balance at Mar. 29, 2019 308,423   $ 300 207,911 (2,166) 102,378  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income 7,746         7,746  
Stock compensation (in shares)     346,915        
Stock compensation 1,088   $ 3 1,085      
Exercise of stock options (in shares)     7,193        
Exercise of stock options 146     146      
Cumulative translation adjustment 118       118    
Shares surrendered to pay withholding taxes (in shares)     (3,928)        
Shares surrendered to pay tax withholding (126)     (126)      
Balance (in shares) at Jun. 28, 2019     30,291,364        
Balance at Jun. 28, 2019 $ 317,395   $ 303 209,016 (2,048) 110,124  
Balance (in shares) at Dec. 27, 2019 30,341,941   30,341,941        
Balance at Dec. 27, 2019 $ 335,933   $ 304 212,240 (2,048) 125,437  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income (14,085)         (14,085)  
Stock compensation (in shares)     807,433        
Stock compensation 851   $ 8 843      
Cumulative translation adjustment (378)       (378)    
Shares surrendered to pay withholding taxes (in shares)     (159,632)        
Shares surrendered to pay tax withholding (2,704)   $ (2) (2,702)      
Balance (in shares) at Mar. 27, 2020     30,989,742        
Balance at Mar. 27, 2020 $ 319,617   $ 310 210,381 (2,426) 111,352  
Balance (in shares) at Dec. 27, 2019 30,341,941   30,341,941        
Balance at Dec. 27, 2019 $ 335,933   $ 304 212,240 (2,048) 125,437  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income (34,419)            
Cumulative translation adjustment $ (261)            
Balance (in shares) at Jun. 26, 2020 37,798,548   37,798,548        
Balance at Jun. 26, 2020 $ 387,317   $ 378 298,230 (2,309) 91,018  
Balance (in shares) at Mar. 27, 2020     30,989,742        
Balance at Mar. 27, 2020 319,617   $ 310 210,381 (2,426) 111,352  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net (loss) income (20,334)         (20,334)  
Stock compensation (in shares)     176,037        
Stock compensation 1,999   $ 2 1,997      
Public offering of common stock (in shares)     6,634,615        
Public offering of common stock 85,941   $ 66 85,875      
Cumulative translation adjustment 117       117    
Shares surrendered to pay withholding taxes (in shares)     (1,846)        
Shares surrendered to pay tax withholding $ (23)     (23)      
Balance (in shares) at Jun. 26, 2020 37,798,548   37,798,548        
Balance at Jun. 26, 2020 $ 387,317   $ 378 $ 298,230 $ (2,309) $ 91,018