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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 11, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]        
Number of shares of common stock issued to certain board members in lieu of cash compensation   12,295 36,160  
Number of common stock available for future grant   1,373,834 1,373,834  
Shares remaining outstanding   2,264,141 2,264,141 1,577,541
Employee Stock Option        
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]        
Unrecognized employee stock based compensation expense   $ 6.7 $ 6.7  
Unrecognized employee stock based compensation expense, period for recognition     2 years 8 months 1 day  
2018 Omnibus Incentive Plan        
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]        
Increase in number of shares of common stock reserved for issuance. 1,300,000      
Common Stock, Capital Shares Reserved for Future Issuance 2,800,000