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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Income (loss) before income taxes	$ 1,790,306	$ 604,673	$ 4,853,878	$ (1,481,611)
Income tax provision	(16,183)		250,954
Effective tax rate		0.00%	5.17%
Maximum
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date			At various dates through December 2031
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Net operating loss carryforwards	53,972,000		53,972,000
Business tax credit carryforwards	2,312,000		2,312,000
Available to Reduce Future State Income Taxes
Income Taxes [Line Items]
Net operating loss carryforwards	4,361,000		4,361,000
Business tax credit carryforwards	$ 2,934,000		$ 2,934,000

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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