Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Line Items]
Income (loss) before income taxes	$ 1,778,193	$ (55,597)	$ 3,063,572	$ (2,086,284)
Income tax provision	208,230		267,137
Effective tax rate	8.72%		8.72%
Maximum
Income Taxes [Line Items]
Net operating loss and business tax credit carryforwards expiration date			At various dates through December 2031
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Net operating loss carryforwards	58,243,000		58,243,000
Business tax credit carryforwards	2,196,000		2,196,000
Available to Reduce Future State Income Taxes
Income Taxes [Line Items]
Net operating loss carryforwards	4,816,000		4,816,000
Business tax credit carryforwards	$ 2,986,000		$ 2,986,000