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Basic and Diluted Earnings Per Share - Summary of Number of Options, Restricted Stock Units (Detail) - shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Earnings Per Share, Amount 19,511,000 13,264,000
Options to purchase common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Earnings Per Share, Amount 15,666,000 12,134,000
Restricted stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Earnings Per Share, Amount 3,795,000 1,030,000
Restricted stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Earnings Per Share, Amount 50,000 100,000