Ten Percent Convertible Redeemable Preferred Stock (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2011
Temporary Equity [Line Items]
Unamortized discount			$ (828,340)
Redeemable preferred stock, net of discount	5,922,612	5,762,756
Redeemable Preferred Stock
Temporary Equity [Line Items]
Redeemable preferred stock - face value	7,060,230	7,522,730
Accrued dividends	0	176,620
Unamortized discount	(1,137,618)	(2,179,094)
Redeemable preferred stock, net of discount	$ 5,922,612	$ 5,520,256