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Stock Based Compensation - Summary of Changes in Company's Stock Options (Details) - Stock Options
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock Options, Beginning Balance | shares 185,328
Stock Options, Granted | shares 51,952
Stock Options, Exercised | shares (2,556)
Stock Options, Forfeited or expired | shares (3,186)
Stock Options, Ending Balance | shares 231,538
Stock Options, Fully vested shares and shares expected to vest at September 30, 2018 | shares 231,538
Stock Options, Shares exercisable at September 30, 2018 | shares 75,550
Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 18.97
Weighted-Average Exercise Price, Granted | $ / shares 38.75
Weighted-Average Exercise Price, Exercised | $ / shares 17.16
Weighted-Average Exercise Price, Forfeited or expired | $ / shares 18.98
Weighted-Average Exercise Price, Ending Balance | $ / shares 23.43
Weighted-Average Exercise Price, Fully vested shares and shares expected to vest at September 30, 2018 | $ / shares 23.43
Weighted-Average Exercise Price, Shares exercisable at September 30, 2018 | $ / shares $ 17.73
Weighted-Average Remaining Contractual Term, Outstanding at September 30, 2018 8 years 2 months 19 days
Weighted-Average Remaining Contractual Term, Fully vested shares and shares expected to vest at September 30, 2018 8 years 2 months 19 days
Weighted-Average Remaining Contractual Term, Shares exercisable at September 30, 2018 7 years 8 months 8 days
Aggregate Intrinsic Value, Outstanding at September 30, 2018 | $ $ 3,448
Aggregate Intrinsic Value, Fully vested shares and shares expected to vest at September 30, 2018 | $ 3,448
Aggregate Intrinsic Value, Shares exercisable at September 30, 2018 | $ $ 1,547