Warrant Activity (Detail) (Warrant, USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Warrant
Number of Shares Issuable
Balance, Beginning	5,452,141	5,329,783
Granted	22,048,510	582,358
Exercised	0	(460,000)
Cancelled	(147,500)
Balance, Ending	27,353,151	5,452,141
Weighted Average Exercise Price
Balance, Beginning	$ 1.18	$ 1.16
Granted	$ 0.67	$ 0.90
Exercised		$ 0.60
Cancelled	$ 2.25
Balance, Ending	$ 0.76	$ 1.18