Stock-Based Compensation - Summary of Stock Option Plan Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, beginning	191,002		120,617
Granted, shares	7,000		89,500
Forfeited, shares	(344)		(11,519)
Exercised, shares	0		0
Expired, shares	(7,239)		(7,596)
Options outstanding, ending	190,419		191,002		120,617
Options outstanding, beginning, Weighted Average Exercise Price	$ 7.35		$ 9.51
Options exercisable, ending	190,419
Granted, Weighted Average Exercise Price	$ 5.99		$ 5.25
Forfeited, Weighted Average Exercise Price	$ 5.90		$ 9.42
Exercised, Weighted Average Exercise Price	$ 0		$ 0
Expired, Weighted Average Exercise Price	$ 14.65		$ 13.80
Options outstanding, ending, Weighted Average Exercise Price	$ 7.02		$ 7.35		$ 9.51
Options exercisable, ending, Weighted Average Exercise Price	$ 7.02
Options outstanding, ending, Weighted Average Remaining Contractual Life	6 years 2 months 12 days		6 years 9 months 18 days		5 years 4 months 24 days
Options exercisable, ending, Weighted Average Remaining Contractual Life	6 years 2 months 12 days
Options outstanding, ending, Aggregate Intrinsic Value	$ 32,718	[1]	$ 14,146	[1]
Options exercisable, ending, Aggregate Intrinsic Value	$ 32,718	[1]

[1] The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2014. This amount changes based on changes in the market value of the Company's common stock.