Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Inputs to Option Valuation Model for Options Granted

The following table summarizes the inputs to the option valuation model for the options granted during the years ended December 31, 2018 and 2017:

	2018			2017
Expected volatility		31	%	27%
Dividend rate	0%			0%
Expected term (in years)	3.55			3.55
Risk-free rate		2.65	%	2.01%

Information About Stock Options Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable at December 31, 2018:

	Number of Shares Outstanding			Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)		Aggregate Intrinsic Value (in thousands)
Option Balances at December 31, 2017		181,385		$	4.98	$	1.30	2.4		$	158
Options Granted		6,067			6.14		1.65
Options Exercised		(9,376	)		3.89		0.94
Options Forfeited		(506	)		4.34		0.87
Options Expired		(23,693	)		7.26		2.33
Option Balances at December 31, 2018		153,877		$	4.75	$	1.18		2.0	$	208
Options Exercisable at December 31, 2018		124,855		$	4.61	$	1.19		1.6	$	186