Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of stock option activity as of and for the year ended December 31, 2018 is presented below:

	Non-vested stock					Stock options
	options outstanding					outstanding
				Weighted-					Weighted-		Weighted-
				average					average		average
	Number			grant-date		Number			exercise		contractual
	of shares			fair value		of shares			price		term (years)
Outstanding at December 31, 2017		247,200		$	7.94		884,050		$	23.53
Stock options granted		131,350			10.33		131,350			21.34
Stock options exercised		-			-		(48,075	)		14.89
Stock options vested		(101,142	)		8.28		-			-
Stock options forfeited		(13,625	)		7.27		(105,300	)		32.69
Outstanding at December 31, 2018		263,783		$	9.04		862,025		$	22.56		6.0
Exercisable at December 31, 2018							598,242		$	24.38		4.6

Schedule of Assumptions Used to Determine Fair Value of Stock Options Granted

The assumptions used to determine the fair value of stock options granted are detailed in the table below:

	2018			2017			2016
Risk-free interest rate	2.63% to 3.10%			1.92% to 2.29%			1.42% to 2.39%
Dividend yield		0.0	%		0.0	%		0.0	%
Expected market price volatility	45% to 52%			45% to 53%			51% to 53%
Weighted-average expected market price volatility		49.1	%		47.4	%		51.0	%
Expected term	4.7 to 6.8 years			5.6 to 7.5 years			5.6 to 7.5 years

Summary of Restricted Stock Activity

A summary of restricted stock activity for the years ended December 31, 2018 and 2017 is presented below:

					Weighted-
					average
	Number				grant-date
	of shares				fair value
Balance, December 31, 2016		95,000		$		14.75
Restricted stock granted in May		6,780				18.00
Restricted stock granted in November		7,500				20.29
Restricted stock forfeited		(27,000	)			14.96
Balance, December 31, 2017		82,280				15.45
Restricted stock granted in February		9,530				26.23
Restricted stock granted in May		5,136				24.20
Restricted stock vested in May		(2,260	)			18.00
Restricted stock granted in November		10,666				19.46
Restricted stock vested in December		(25,000	)			14.75
Balance, December 31, 2018		80,352		$		17.97