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Stock Option Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Exercise of Stock Options	$ 0	$ 0
Unrecognized stock compensation expense	$ 147,257
Weighted average recognition period	1 year 4 months 24 days
Vested options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Exercisable Options Outstanding Shares	162,918
Weighted average exercise price per share	$ 10.52
Weighted average remaining contractual term on unvested options	5 years 4 months 24 days
Unvested Options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Exercisable Options Outstanding Shares	29,811
Weighted average exercise price per share	$ 10.55
Weighted average remaining contractual term on unvested options	7 years 6 months

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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