Warrant Liability (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 18, 2011	Jun. 30, 2012	Dec. 31, 2011
Warrant Liability (Textual) [Abstract]
Number of common stock sold	36,978,440
Selling price per share	$ 0.60
Number of warrants issued to purchase common stock	14,791,376
Warrants exercisable	$ 0.75
Gross proceeds from Piper Jaffray & Co.	$ 22.2
Net proceeds from Piper Jaffray & Co. to company	20.4
Expiry period of warrants	5 years
Warrant liability	6.4	2.9	4.2
Decrease in warrant liability		$ 1.3