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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 |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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