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Weighted Average Shares - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Compensation Plan [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options to purchase anti-dilutive common stock 5,735,608 2,650,164 3,363,141
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options to purchase anti-dilutive common stock 13,092