Stock Based Compensation - Summary of Stock Options Outstanding, Vested, Expected to Vest and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	828,526	470,985
Options vested and expected to vest, Number of Shares	743,785
Options exercisable, Number of Shares	272,008
Options outstanding, Weighted Average Exercise Price	$ 9.53	$ 8.69
Options vested and expected to vest, Weighted Average Exercise Price	9.45
Options exercisable, Weighted Average Exercise Price	$ 7.94
Options outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 5 months 13 days
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	5 years 3 months 18 days
Options exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 4 months 20 days
Options outstanding, Aggregate Intrinsic Value	$ 601
Options vested and expected to vest, Aggregate Intrinsic Value	597
Options exercisable, Aggregate Intrinsic Value	$ 555