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Retirement and Share-based Compensation Plans - Additional Information (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 11, 2018
shares
Dec. 31, 2018
USD ($)
Anniversary
$ / shares
shares
Oct. 23, 2018
shares
Restricted Stock Awards      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares, granted   140,000  
Grant date fair market value | $   $ 1.4  
Stock Option Award      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares, granted   215,000  
Stock options exercise price at grant date | $ / shares   $ 10.00  
Dividend yield percentage   0.00%  
Estimated grant date fair value | $   $ 0.9  
2018 Equity Incentive Plan      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Restricted stock awards and options granted, vesting period   4 years  
Restricted stock awards and options granted, vesting percentage   25.00%  
Restricted stock awards and options granted, number of anniversaries | Anniversary   3  
Stock options, contractual term   10 years  
Stock options exercise price at grant date | $ / shares   $ 10.00  
Restricted stock awards and options granted, vesting description   All restricted stock awards and options granted under the Plan have a service vesting period of 4 years, vesting 25% on December 10, 2019, and the subsequent three anniversaries of such date.  
2018 Equity Incentive Plan | Restricted Stock Awards      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares, granted 140,000    
2018 Equity Incentive Plan | Stock Option Award      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares, granted 215,000    
Common Stock | 2018 Equity Incentive Plan      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares, future grant   125,000  
Common Stock | 2018 Equity Incentive Plan | Maximum      
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]      
Number of shares authorized     480,000