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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, 2018
USD ($)
$ / shares
shares
Schedule Of Stock Option Activity [Line Items]  
Option Outstanding, Shares, Beginning balance | shares 323,666
Option Granted, Shares | shares 31,122
Option Exercised, Shares | shares (36,221)
Option Forfeited, Shares | shares (11,250)
Option Outstanding, Shares, Ending balance | shares 307,317
Option Exercisable, Shares, Ending balance | shares 191,410
Option Outstanding, Weighted Average Exercise Price, Beginning balance | $ / shares $ 11.50
Option Granted, Weighted Average Exercise Price | $ / shares 19.31
Option Exercised, Weighted Average Exercise Price | $ / shares 10.34
Option Forfeited, Weighted Average Exercise Price | $ / shares 15.60
Option Outstanding, Weighted Average Exercise Price, Ending balance | $ / shares 12.28
Option Exercisable, Weighted Average Exercise Price, Ending balance | $ / shares $ 10.67
Option Outstanding, Weighted Average Remaining Contractual Term 6 years 10 months 20 days
Option Exercisable, Weighted Average Remaining Contractual Term 6 years 2 months 8 days
Option Outstanding, Aggregate Intrinsic Value | $ $ 1,077,096
Option Exercisable, Aggregate Intrinsic Value | $ $ 977,748