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Share-Based Compensation - Summary of Option Activity (Detail) - Option Activity Under the 2003 Plan [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Schedule Of Stock Option Activity [Line Items]  
Option Outstanding, Shares, Beginning balance | shares 21,300
Option Exercised, Shares | shares (8,625)
Option Outstanding, Shares, Ending balance | shares 12,675
Option Exercisable, Shares, Ending balance | shares 12,675
Option Outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 5.03
Option Exercised, Weighted Average Exercise Price | $ / shares 4.45
Option Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 5.42
Option Exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 5.42
Option Outstanding, Weighted Average Remaining Contractual Term 1 year 14 days
Option Exercisable, Weighted Average Remaining Contractual Term 1 year 14 days
Option Outstanding, Aggregate Intrinsic Value | $ $ 172,096
Option Exercisable, Aggregate Intrinsic Value | $ $ 172,096