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Stock Based Compensation - Summary of Changes in Company's Stock Options (Details) - Stock Options
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock Options, Beginning Balance | shares 163,661
Stock Options, Granted | shares 58,729
Stock Options, Exercised | shares (34,977)
Stock Options, Forfeited or expired | shares (2,085)
Stock Options, Ending Balance | shares 185,328
Stock Options, Fully vested shares and shares expected to vest at December 31, 2017 | shares 185,328
Stock Options, Shares exercisable at December 31, 2017 | shares 31,742
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 15.87
Weighted Average Exercise Price, Granted | $ / shares 25.80
Weighted Average Exercise Price, Exercised | $ / shares 15.87
Weighted Average Exercise Price, Forfeited or expired | $ / shares 19.69
Weighted Average Exercise Price, Ending Balance | $ / shares 18.97
Weighted Average Exercise Price, Fully vested shares and shares expected to vest at December 31, 2017 | $ / shares 18.97
Weighted Average Exercise Price, Shares exercisable at December 31, 2017 | $ / shares $ 15.87
Weighted Average Remaining Contractual Term, Outstanding at December 31, 2017 8 years 6 months 25 days
Weighted Average Remaining Contractual Term, Fully vested shares and shares expected to vest at December 31, 2017 8 years 6 months 25 days
Weighted Average Remaining Contractual Term, Shares exercisable at December 31, 2017 8 years 3 months
Aggregate Intrinsic Value, Outstanding at December 31, 2017 | $ $ 2,321
Aggregate Intrinsic Value, Fully vested shares and shares expected to vest at December 31, 2017 | $ 2,321
Aggregate Intrinsic Value, Shares exercisable at Decembet 31, 2017 | $ $ 496