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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 13, 2018
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted   282,200  
Number of common stock available for future grant   1,597,021  
Shares remaining outstanding   1,071,899  
2018 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted 1,500,000    
2018 Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock available for future grant   120,000  
Number of common stock authorized for issuance   120,000  
Number of common stock stock issued   0  
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term of stock options   5 years 11 months 4 days 6 years 14 days
Unrecognized employee stock based compensation expense   $ 5.9  
Unrecognized employee stock based compensation expense, period for recognition   2 years 10 months 17 days