Stock Option Activity (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Shares, Outstanding
Beginning Balance	53,600
Options exercised	(37,100)
Options forfeited
Ending Balance	16,500	53,600
Shares, Exercisable	16,500
Weighted Average Exercise Price, Outstanding
Beginning Balance	$ 2.09
Options exercised	$ 1.91
Options forfeited
Ending Balance	$ 2.51	$ 2.09
Weighted Average Exercise Price, Exercisable	$ 2.51
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	6 months 26 days	1 year 3 months 15 days
Weighted Average Remaining Contractual Life, Exercisable	6 months 26 days
Outstanding Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding	$ 513,004	$ 1,625,995
Aggregate Intrinsic Value, Exercisable	$ 513,004

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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