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Share-Based Compensation - Summary of Option Activity Under 2013 Plan (Detail) - Option Activity Under the 2013 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 307,317
Option Granted, Shares | shares 35,966
Option Exercised, Shares | shares (24,256)
Option Forfeited, Shares | shares (2,250)
Option Outstanding, Shares, Ending balance | shares 316,777
Option Exercisable, Shares, Ending balance | shares 242,814
Option Outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 12.28
Option Granted, Weighted Average Exercise Price | $ / shares 16.74
Option Exercised, Weighted Average Exercise Price | $ / shares 9.75
Option Forfeited, Weighted Average Exercise Price | $ / shares 10.38
Option Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 12.99
Option Exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 11.58
Option Outstanding, Weighted Average Remaining Contractual Term 6 years 4 months 13 days
Option Exercisable, Weighted Average Remaining Contractual Term 5 years 8 months 26 days
Option Outstanding, Aggregate Intrinsic Value | $ $ 1,822,924
Option Exercisable, Aggregate Intrinsic Value | $ $ 1,802,010