U.S. Federal Tax Rate (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate [Line Items]
Tax (benefit) provision computed at the federal statutory rate	$ (1,901,595)	$ (3,837,164)
State income tax (benefit), net of federal income tax effect	(271,656)	(548,166)
Nondeductible permanent differences	(468,568)	1,468,778
Change in valuation allowance	2,641,819	2,916,552
Provision for income taxes	$ 0	$ 0