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Stock Based Compensation - Narrative (Detail) - shares
2 Months Ended
Jun. 19, 2015
Feb. 28, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiring period of equity options to employees 10 years    
Vesting period 4 years    
2015 Stock Options Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in number of shares available for grant (in shares) 3,175,000    
Number of shares available for grant (in shares)     3,207,975
2015 Stock Options Plan | Subsequent Event      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock issued, stock-based compensation plans (in shares)   34,487