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Shareholders' Equity Equity Issuances (Details) (USD $) | 6 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  | 2 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Nov. 19, 2010 | Sep. 30, 2012 Private Placement [Member] | Sep. 30, 2011 Aspire Capital Purchase Agreement [Member] | Sep. 28, 2011 Aspire Capital Purchase Agreement [Member] | May 03, 2013 Aegis Capital Purchase Agreement [Member] | May 01, 2013 Aegis Capital Purchase Agreement [Member] | Feb. 28, 2013 Aspire Capital Purchase Agreement [Member] | Jun. 30, 2013 Aspire Capital Purchase Agreement [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Committment Value Under Purchase Agreement |  |  |  |  |  |  | $ 20,000,000 |  |  |  |
Term Of Agreement In Months |  |  |  |  |  |  | 24 |  |  |  |
Discount Applied To Weighted Average Price |  |  |  |  |  |  | 5.00% |  |  |  |
Shares, Issued |  |  |  |  |  | 99,010 |  |  |  |  |
Warrant Inducements (in shares) |  |  |  |  | 161,290 |  |  |  |  |  |
Investment Warrants, Exercise Price |  |  |  |  | $ 6.00 |  |  |  |  |  |
Shares, Issued |  |  |  |  |  |  |  |  | 2,000,000 |  |
Sale of Stock, Price Per Share |  |  |  | $ 0.945 |  |  |  |  | $ 5 |  |
Proceeds from Issuance of Common Stock Gross |  |  |  |  |  |  |  | 11,500,000 |  |  |
Common Stock, Shares, Issued | 19,584,375 |  | 16,375,365 |  |  |  |  |  | 300,000 | 654,255 |
Net proceeds from issuance of common stock | 14,248,148 | 9,951,227 |  |  |  |  |  |  |  | 3,800,000 |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  |  |  |  |  | $ 12,900,000

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