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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2019
Jun. 27, 2018
Jun. 26, 2019
Jun. 27, 2018
Dec. 26, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock, options outstanding (shares) 2,303,921   2,303,921   2,102,404
Common stock, options vested (shares)     1,708,169    
Common stock, options unvested (shares) 595,752   595,752    
Number of options granted at fair market value (shares)     320,536    
Stock options exercised (shares)     (6,709)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 7.92   $ 7.92   $ 7.68
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     11.47    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price     $ 11.94    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period     (112,310)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 13.41    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 2,289,608   2,289,608    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 7.89   $ 7.89    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,708,169   1,708,169    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 6.71   $ 6.71    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     28.70% 28.30%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     2.33% 2.88%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years 3 months 6 years 3 months  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00% 0.00%  
Unvested restricted shares outstanding (shares) 642,112   642,112   490,700
Shares granted (shares)     285,996    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 11.21   $ 11.21   $ 10.91
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 11.47    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (89,862)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 10.09    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period     (44,722)    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures And Expired Weighted Average Grant Date Fair Value     $ 11.83    
Stock-based compensation $ 600 $ 600 $ 1,129 $ 1,170  
Premium Options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock, options outstanding (shares) 1,381,010   1,381,010    
Employee Stock Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation expense $ 2,100   $ 2,100    
Unrecognized compensation expense, period for recognition     3 years 4 months 28 days    
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation expense, period for recognition     3 years 2 months 20 days    
Unvested restricted shares outstanding (shares) 517,389   517,389    
Unrecognized compensation expense $ 5,300   $ 5,300    
Performance Shares          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation expense, period for recognition     3 years 10 months 15 days    
Unvested restricted shares outstanding (shares) 36,058   36,058    
Unrecognized compensation expense $ 100   $ 100    
Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation expense, period for recognition     3 years    
Unvested restricted shares outstanding (shares) 88,665   88,665    
Unrecognized compensation expense $ 900   $ 900