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Share-based Compensation - Schedule of Unvested RSU Activity (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Sep. 05, 2018
Jan. 16, 2019
Jun. 30, 2019
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock units granted     183,500
Grant date fair value per share     $ 7.25
2018 Stock Incentive Plan | Performance Based Restricted Stock Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock units granted   90,000  
2018 Stock Incentive Plan | Performance Based Restricted Stock Units | Executive Officers and Directors      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock units granted 1,487,500    
Grant date fair value per share $ 7.69    
Vesting period 3 years    
Gross revenue threshold limit for vesting of grants $ 7.0    
2018 Stock Incentive Plan | Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock units granted   183,500  
Grant date fair value per share   $ 7.25  
2018 Stock Incentive Plan | Restricted Stock Units (RSUs) | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period   3 years  
2018 Stock Incentive Plan | Restricted Stock Units (RSUs) | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period   4 years  
2018 Stock Incentive Plan | Restricted Stock Units (RSUs) | Executive Officers and Directors | Time-Based Vesting, Year One      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting percentage 33.33%    
Vesting date Jul. 01, 2019    
2018 Stock Incentive Plan | Restricted Stock Units (RSUs) | Executive Officers and Directors | Time-Based Vesting, Year Two      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting percentage 33.33%    
Vesting date Jul. 01, 2020    
2018 Stock Incentive Plan | Restricted Stock Units (RSUs) | Executive Officers and Directors | Time-Based Vesting, Year Three      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting percentage 33.33%    
Vesting date Jul. 01, 2021