Stock Incentive Plan - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of authorized stock for stock incentive plan (in shares)	350,000		350,000
Stock-based compensation expense			$ 531	$ 357
Exercise of stock options (in shares)	5,342	4,938	5,342	5,162
Proceeds from exercise of stock options	$ 847	$ 160	$ 847	$ 209
Shares withheld for stock option exercises and related income taxes, amount withheld	907	63	$ 907	$ 112
Options granted (in shares)			0	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation options contractual term			10 years
Stock incentive plan vesting period, years			3 years
Stock-based compensation expense	34	22	$ 121	$ 66
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan vesting period, years			3 years
Stock-based compensation expense	$ 120	$ 98	$ 410	$ 291
Restricted units granted (in shares)			0	0