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Share-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Compensation expense $ 500,000 $ 600,000
Granted, shares 243,800  
Shares withheld for tax requirements 59,094  
Tax withholding payments for share-based compensation $ 221,000 366,000
Common Stock [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Closing stock price per share $ 3.18  
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 243,800 252,400
Weighted-average grant-date fair value per share $ 1.36 $ 1.23
Unrecognized compensation expense $ 500,000  
Weighted-average period of recognition 3 years 6 months  
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 3 years  
Fair value of nonvested share awards $ 700,000 $ 900,000
Issuance of nonvested share awards, Shares 236,120 195,620
Weighted-average grant-date fair value per share, granted $ 3.73 $ 6.85
Unrecognized compensation expenses $ 3,300,000  
Nonvested Share Unit Awards [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-average period of recognition 2 months 12 days  
Fair value of nonvested share awards $ 0 $ 0
Unrecognized compensation expenses $ 28,000  
Amendments and Restatements of 2007 Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares available for future grant 548,803