Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Line Items]
Federal income tax rate	34.00%	34.00%	34.00%
Valuation allowance	$ 18,067,789	$ 15,038,936	$ 14,414,582
Percentage of change in ownership for operating loss carry forward				50.00%
Annual limitation on use of pre -ownership changes losses	284,000
Net operating loss carryforwards	36,200,000
Carryforward period of ownership	20 years
Utilize pre-ownership change losses	5,600,000
Write-off deferred tax assets			10,400,000
Federal net operating loss carryforwards expiration year start	2020
U.S Federal [Member]
Income Tax [Line Items]
Net operating loss carryforwards	$ 19,100,000