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Share-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense $ 500,000 $ 600,000 $ 1,700,000 $ 1,800,000
Granted, shares     254,900  
Proceeds from exercise of share option awards     $ 31,000 67,000
Shares withheld for tax requirements     53,343  
Tax withholding payments for share-based compensation     $ 366,000 805,000
Common Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Closing stock price per share $ 5.10   $ 5.10  
Tax withholding payments for share-based compensation     $ 1,000 $ 1,000
Share Option Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum expiration period of share based payment awards granted     10 years  
Granted, shares     254,900 0
Weighted-average grant-date fair value per share     $ 1.23  
Intrinsic value of share option awards exercised     $ 10,000 $ 79,000
Proceeds from exercise of share option awards     31,000 67,000
Tax benefit realized for the expected tax deduction from share option award exercises     3,000 31,000
Unrecognized compensation expense $ 300,000   $ 300,000  
Weighted-average period of recognition     3 years 4 months 24 days  
Share Option Awards [Member] | Share-based Compensation Award, Tranche One [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights (as percentage)     25.00%  
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights (as percentage)     25.00%  
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member] | Non-Employee Directors [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights (as percentage)     100.00%  
Nonvested Share Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted-average period of recognition     2 years 6 months  
Fair value of nonvested share awards     $ 1,000,000 $ 2,000,000
Issuance of nonvested share awards, Shares     213,062 191,000
Weighted-average grant-date fair value per share, granted     $ 6.99 $ 14.88
Unrecognized compensation expenses 3,500,000   $ 3,500,000  
Nonvested Share Unit Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted-average period of recognition     8 months 12 days  
Fair value of nonvested share awards     $ 300,000 $ 300,000
Issuance of nonvested share awards, Shares     34,884 21,000
Weighted-average grant-date fair value per share, granted     $ 8.60 $ 13.90
Unrecognized compensation expenses $ 200,000   $ 200,000