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Net Income Per Share - Summary of Potential Ordinary Shares Outstanding Excluded from Computation of Diluted Net Loss Per Ordinary Share (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential ordinary shares outstanding excluded from the computation of diluted net loss per ordinary share 902,655 1,117,334 768,266
RSUs [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential ordinary shares outstanding excluded from the computation of diluted net loss per ordinary share 45,893