Shareholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	1 Months Ended			3 Months Ended	9 Months Ended			1 Months Ended			3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Underwriting Offering [Member]	Jul. 31, 2012 Underwriting Offering [Member]	Apr. 30, 2012 Underwriting Offering [Member]	Mar. 31, 2012 Underwriting Offering [Member]	Sep. 30, 2012 Underwriting Offering [Member]	Sep. 30, 2012 Common Stock [Member]	Sep. 30, 2012 2009 Equity Plan [Member]	Sep. 30, 2012 July 2012 New Warrant [Member]	Aug. 31, 2012 Aspire Capital Purchase Agreement [Member]	Jul. 31, 2012 May-July 2012 private placement warrants [Member]	Aug. 31, 2012 Warrant holder A [Member]	Sep. 30, 2012 Warrant holder A [Member]	Dec. 31, 2009 Warrant holder A [Member]	Aug. 31, 2012 Warrant holder B [Member]	Sep. 30, 2012 Warrant holder B [Member]	Jul. 31, 2012 July 2012 New Warrant [Member]	Sep. 30, 2012 July 2012 New Warrant [Member]	Sep. 30, 2012 Private Placement [Member]	Jul. 31, 2012 Minimum [Member] July 2012 New Warrant [Member]	Sep. 30, 2012 Minimum [Member] Private Placement [Member]	Jul. 31, 2012 Maximum [Member] July 2012 New Warrant [Member]	Sep. 30, 2012 Maximum [Member] Private Placement [Member]	Aug. 31, 2012 Common Stock [Member] Aspire Capital Purchase Agreement [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			2,649,236
Stock Issued During Period, Shares, New Issues								2,000,000	15,000,000		28,765,623												11,800,000
Common Stock, Par or Stated Value Per Share	$ 0.001		$ 0.001		$ 0.001				$ 0.40
Number of Shares of Common Stock Per Unit									1
Warrant Expiration Period									5 years					5 years							5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights						0.51	0.51		0.51	0.51				0.60	0.51	0.51		2.50	1.85					0.66	0.51	0.69	0.74
Extension of term of purchase agreement (in months)														24 months
Proceeds from Warrant Exercises			$ 5,925,931	$ 0		$ 700,000	$ 1,600,000								$ 1,400,000								$ 6,100,000
Shares Issued in Period												1,039,339
Shares Issued in Lieu of Cash Compensation													398,115
Proceeds from Issuance of Common Stock Gross								800,000	6,000,000
Proceeds from Issuance of Common Stock Net								744,000	5,297,000
Warrants Issued During Period																							8,300,000
Class of Warrant or Right, Additional Number of Securities Called by Warrants or Rights						1,457,212				1,457,212									300,000
Exercise of Warrants Issued							3,150,344								2,808,140
Warrant Inducements	1,012,819	0	1,012,819	0						0							200,000			400,000		400,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																2,100,000			344,825									1,612,903
Exercise price of Warrants																			$ 1.45
Proceeds from Issuance of Warrants																$ 1,100,000			$ 1,100,000
Warrant inducements (in shares)											1,458,952								1,458,952
Warrant Inducement Per Share						$ 0.03