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Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2019
Mar. 29, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized stock-based compensation expense   $ 490,000 $ 459,000
Stock units issued   158,000  
Stock units issued, grant-date fair value   $ 3.88  
Stock-based compensation expense   $ 490,000 459,000
Common Share Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized stock-based compensation expense   200,000 300,000
Unrecognized stock compensation expense   $ 600,000  
Unrecognized stock compensation expense, recognition period   2022  
Stock-based compensation expense   $ 200,000 300,000
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized stock-based compensation expense   $ 0 0
Vesting description   The PSUs will vest fully on the third anniversary of the grant date. The quantity of shares that will vest ranges from 0% to 200% of the targeted number of shares. If the defined minimum targets are not met, then no shares will vest.  
Stock units issued 188,414    
Stock units issued, grant-date fair value $ 8.46    
Stock-based compensation expense   $ 0 0
Performance Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage of targeted number of shares 0.00%    
Performance Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage of targeted number of shares 200.00%    
Employee and Non Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants vesting period   4 years  
Method used to determine fair value of the options   Black-Scholes option pricing model  
Stock options granted   0  
Non-Employee Board Of Directors [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants vesting period   3 years  
Recognized stock-based compensation expense   $ 200,000 300,000
Unrecognized stock compensation expense   $ 1,900,000  
Unrecognized stock compensation expense, recognition period   2023  
Vesting description   The employee grants vest in one-third increments over a three-year period.  
Stock-based compensation expense   $ 200,000 $ 300,000
Non-Employee Board Of Directors [Member] | Restricted Stock Units (RSUs) [Member] | First Anniversary [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   50.00%  
Non-Employee Board Of Directors [Member] | Restricted Stock Units (RSUs) [Member] | Second Anniversary [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   50.00%