Shareholders' Equity Equity Issuances (Details) (USD $)	3 Months Ended					0 Months Ended	2 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Sep. 30, 2011 Aspire Capital Purchase Agreement [Member]	Sep. 28, 2011 Aspire Capital Purchase Agreement [Member]	Sep. 30, 2012 Private Placement [Member]	Feb. 28, 2013 Aspire Capital Purchase Agreement [Member]	Mar. 31, 2013 Aspire Capital Purchase Agreement [Member]
Class of Stock [Line Items]
weighted average estimated fair value of restricted stock	$ 0.64	$ 0.48
Committment Value Under Purchase Agreement					$ 20,000,000
Shares, Issued				990,099
Term Of Agreement In Months					24
Discount Applied To Weighted Average Price					5.00%
Stock Issued During Period, Shares, Warrant Inducements						1,612,903
Investment Warrants, Exercise Price						$ 0.60
Common Stock, Shares, Issued	170,278,731		163,753,653				4,500,000
Proceeds from issuance of common stock	2,730,263	7,691,059					2,800,000
Purchase Commitment, Remaining Minimum Amount Committed								$ 13,900,000