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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, 2018
USD ($)
$ / shares
shares
Schedule Of Stock Option Activity [Line Items]  
Option Outstanding, Shares, Beginning balance | shares 41,175
Option Exercised, Shares | shares (19,875)
Option Outstanding, Shares, Ending balance | shares 21,300
Option Exercisable, Shares, Ending balance | shares 21,300
Option Outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 4.91
Option Exercised, Weighted Average Exercise Price | $ / shares 4.80
Option Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 5.03
Option Exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 5.03
Option Outstanding, Weighted Average Remaining Contractual Term 1 year 9 months 7 days
Option Exercisable, Weighted Average Remaining Contractual Term 1 year 9 months 7 days
Option Outstanding, Aggregate Intrinsic Value | $ $ 229,004
Option Exercisable, Aggregate Intrinsic Value | $ $ 229,004