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Share-Based Payment Awards - Stock Options - Additional Information (Detail) - shares
1 Months Ended 5 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 30, 2021
Jun. 30, 2021
2016 Long Term Incentive Plan [Member]      
Class Of Stock [Line Items]      
Ratable monthly vesting period 4 years    
Ceased ratable monthly vesting period   4 years  
Contractual life of option grants 10 years    
Stock Compensation Plan [Member]      
Class Of Stock [Line Items]      
Ratable monthly vesting period 1 year 1 year  
Cliff vesting period 3 years 3 years  
Common stock vested during the period     170,283
Newly Appointed Non Executive Director [Member]      
Class Of Stock [Line Items]      
Ratable annual vesting period 3 years    
External consultant [Member]      
Class Of Stock [Line Items]      
Cliff vesting period 1 year